15+-4x=42+-7x

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Solution for 15+-4x=42+-7x equation:


Simplifying
15 + -4x = 42 + -7x

Solving
15 + -4x = 42 + -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.
15 + -4x + 7x = 42 + -7x + 7x

Combine like terms: -4x + 7x = 3x
15 + 3x = 42 + -7x + 7x

Combine like terms: -7x + 7x = 0
15 + 3x = 42 + 0
15 + 3x = 42

Add '-15' to each side of the equation.
15 + -15 + 3x = 42 + -15

Combine like terms: 15 + -15 = 0
0 + 3x = 42 + -15
3x = 42 + -15

Combine like terms: 42 + -15 = 27
3x = 27

Divide each side by '3'.
x = 9

Simplifying
x = 9

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