9-7x=129-42x

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Solution for 9-7x=129-42x equation:


Simplifying
9 + -7x = 129 + -42x

Solving
9 + -7x = 129 + -42x

Solving for variable 'x'.

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

Add '42x' to each side of the equation.
9 + -7x + 42x = 129 + -42x + 42x

Combine like terms: -7x + 42x = 35x
9 + 35x = 129 + -42x + 42x

Combine like terms: -42x + 42x = 0
9 + 35x = 129 + 0
9 + 35x = 129

Add '-9' to each side of the equation.
9 + -9 + 35x = 129 + -9

Combine like terms: 9 + -9 = 0
0 + 35x = 129 + -9
35x = 129 + -9

Combine like terms: 129 + -9 = 120
35x = 120

Divide each side by '35'.
x = 3.428571429

Simplifying
x = 3.428571429

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