42=4x+51-7x

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Solution for 42=4x+51-7x equation: 


Simplifying
42 = 4x + 51 + -7x

Reorder the terms:
42 = 51 + 4x + -7x

Combine like terms: 4x + -7x = -3x
42 = 51 + -3x

Solving
42 = 51 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
42 + 3x = 51 + -3x + 3x

Combine like terms: -3x + 3x = 0
42 + 3x = 51 + 0
42 + 3x = 51

Add '-42' to each side of the equation.
42 + -42 + 3x = 51 + -42

Combine like terms: 42 + -42 = 0
0 + 3x = 51 + -42
3x = 51 + -42

Combine like terms: 51 + -42 = 9
3x = 9

Divide each side by '3'.
x = 3

Simplifying
x = 3

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