-3(x+1)=15

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Solution for -3(x+1)=15 equation: 


Simplifying
-3(x + 1) = 15

Reorder the terms:
-3(1 + x) = 15
(1 * -3 + x * -3) = 15
(-3 + -3x) = 15

Solving
-3 + -3x = 15

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + -3x = 15 + 3

Combine like terms: -3 + 3 = 0
0 + -3x = 15 + 3
-3x = 15 + 3

Combine like terms: 15 + 3 = 18
-3x = 18

Divide each side by '-3'.
x = -6

Simplifying
x = -6

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