3x-40=90-7x

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Solution for 3x-40=90-7x equation:


Simplifying
3x + -40 = 90 + -7x

Reorder the terms:
-40 + 3x = 90 + -7x

Solving
-40 + 3x = 90 + -7x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '7x' to each side of the equation.
-40 + 3x + 7x = 90 + -7x + 7x

Combine like terms: 3x + 7x = 10x
-40 + 10x = 90 + -7x + 7x

Combine like terms: -7x + 7x = 0
-40 + 10x = 90 + 0
-40 + 10x = 90

Add '40' to each side of the equation.
-40 + 40 + 10x = 90 + 40

Combine like terms: -40 + 40 = 0
0 + 10x = 90 + 40
10x = 90 + 40

Combine like terms: 90 + 40 = 130
10x = 130

Divide each side by '10'.
x = 13

Simplifying
x = 13

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