42=3x+7x-4x

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Solution for 42=3x+7x-4x equation:


Simplifying
42 = 3x + 7x + -4x

Combine like terms: 3x + 7x = 10x
42 = 10x + -4x

Combine like terms: 10x + -4x = 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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