Solve 3x − 7 = 50

The solution of 3x − 7 = 50 is x = 19.

3x - 7 = 50\ \Rightarrow\ x = 19

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The lines y = 3x − 7 and y = 50 meet at x = 19. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$3x - 7 = 50$
2
Add 7 to both sides:
$3x - 7 + 7 = 50 + 7 \ \Rightarrow\ 3x = 57$
3
Divide both sides by 3:
$\frac{3x}{3} = \frac{57}{3} \ \Rightarrow\ x = 19$
4
Check: put x = 19 back into the equation.
$3\cdot19 - 7 = 57 - 7 = 50 \checkmark$

LaTeX source of the formulas on this page

\[ 3x - 7 = 50\ \Rightarrow\ x = 19 \]
\[ 3x - 7 = 50 \]
\[ 3x - 7 + 7 = 50 + 7 \ \Rightarrow\ 3x = 57 \]
\[ \frac{3x}{3} = \frac{57}{3} \ \Rightarrow\ x = 19 \]
\[ 3\cdot19 - 7 = 57 - 7 = 50 \checkmark \]

Trying values of x in 3x − 7 = 50

x	3x − 7	Equals 50?
17	44	no
18	47	no
19	50	yes
20	53	no
21	56	no

Questions

What is x in 3x − 7 = 50?

The solution of 3x − 7 = 50 is x = 19.

How do you solve 3x − 7 = 50?

Add 7 to both sides to get 3x = 57, then divide both sides by 3 to get x = 19.

How do I check the answer?

Replace x by 19: 3(19) − 7 = 50, which is 50.

Solve 3x − 7 = 50

How to work it out

Trying values of x in 3x − 7 = 50

Questions

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