-7(-9+4x)=-21

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Solution for -7(-9+4x)=-21 equation: 


Simplifying
-7(-9 + 4x) = -21
(-9 * -7 + 4x * -7) = -21
(63 + -28x) = -21

Solving
63 + -28x = -21

Solving for variable 'x'.

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

Add '-63' to each side of the equation.
63 + -63 + -28x = -21 + -63

Combine like terms: 63 + -63 = 0
0 + -28x = -21 + -63
-28x = -21 + -63

Combine like terms: -21 + -63 = -84
-28x = -84

Divide each side by '-28'.
x = 3

Simplifying
x = 3

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