4x-(-7x)=-21

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Solution for 4x-(-7x)=-21 equation: 


Simplifying
4x + -1(-7x) = -21

Remove parenthesis around (-7x)
4x + -1 * -7x = -21

Multiply -1 * -7
4x + 7x = -21

Combine like terms: 4x + 7x = 11x
11x = -21

Solving
11x = -21

Solving for variable 'x'.

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

Divide each side by '11'.
x = -1.909090909

Simplifying
x = -1.909090909

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