4x-7x=21+42

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Solution for 4x-7x=21+42 equation: 


Simplifying
4x + -7x = 21 + 42

Combine like terms: 4x + -7x = -3x
-3x = 21 + 42

Combine like terms: 21 + 42 = 63
-3x = 63

Solving
-3x = 63

Solving for variable 'x'.

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

Divide each side by '-3'.
x = -21

Simplifying
x = -21

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