-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 = -7x
-7x = 21

Solving
-7x = 21

Solving for variable 'x'.

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

Divide each side by '-7'.
x = -3

Simplifying
x = -3

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