72+3(-3x-4)=-21

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Solution for 72+3(-3x-4)=-21 equation:


Simplifying
72 + 3(-3x + -4) = -21

Reorder the terms:
72 + 3(-4 + -3x) = -21
72 + (-4 * 3 + -3x * 3) = -21
72 + (-12 + -9x) = -21

Combine like terms: 72 + -12 = 60
60 + -9x = -21

Solving
60 + -9x = -21

Solving for variable 'x'.

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

Add '-60' to each side of the equation.
60 + -60 + -9x = -21 + -60

Combine like terms: 60 + -60 = 0
0 + -9x = -21 + -60
-9x = -21 + -60

Combine like terms: -21 + -60 = -81
-9x = -81

Divide each side by '-9'.
x = 9

Simplifying
x = 9

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