-3x-(-4x)=21

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Solution for -3x-(-4x)=21 equation: 


Simplifying
-3x + -1(-4x) = 21

Remove parenthesis around (-4x)
-3x + -1 * -4x = 21

Multiply -1 * -4
-3x + 4x = 21

Combine like terms: -3x + 4x = 1x
1x = 21

Solving
1x = 21

Solving for variable 'x'.

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

Divide each side by '1'.
x = 21

Simplifying
x = 21

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