-3-3(-7+4x)=90

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Solution for -3-3(-7+4x)=90 equation: 


Simplifying
-3 + -3(-7 + 4x) = 90
-3 + (-7 * -3 + 4x * -3) = 90
-3 + (21 + -12x) = 90

Combine like terms: -3 + 21 = 18
18 + -12x = 90

Solving
18 + -12x = 90

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + -12x = 90 + -18

Combine like terms: 18 + -18 = 0
0 + -12x = 90 + -18
-12x = 90 + -18

Combine like terms: 90 + -18 = 72
-12x = 72

Divide each side by '-12'.
x = -6

Simplifying
x = -6

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