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 = 12
3x = 12

Divide each side by '3'.
x = 4

Simplifying
x = 4

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