42=x-7x

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Solution for 42=x-7x equation:


Simplifying
42 = x + -7x

Combine like terms: x + -7x = -6x
42 = -6x

Solving
42 = -6x

Solving for variable 'x'.

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

Add '6x' to each side of the equation.
42 + 6x = -6x + 6x

Combine like terms: -6x + 6x = 0
42 + 6x = 0

Add '-42' to each side of the equation.
42 + -42 + 6x = 0 + -42

Combine like terms: 42 + -42 = 0
0 + 6x = 0 + -42
6x = 0 + -42

Combine like terms: 0 + -42 = -42
6x = -42

Divide each side by '6'.
x = -7

Simplifying
x = -7

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