15=(1*x+3)+(3*x)

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


Simplifying
15 = (1x + 3) + (3x)

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

Remove parenthesis around (3 + 1x)
15 = 3 + 1x + (3x)

Combine like terms: 1x + (3x) = 4x
15 = 3 + 4x

Solving
15 = 3 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
15 + -4x = 3 + 4x + -4x

Combine like terms: 4x + -4x = 0
15 + -4x = 3 + 0
15 + -4x = 3

Add '-15' to each side of the equation.
15 + -15 + -4x = 3 + -15

Combine like terms: 15 + -15 = 0
0 + -4x = 3 + -15
-4x = 3 + -15

Combine like terms: 3 + -15 = -12
-4x = -12

Divide each side by '-4'.
x = 3

Simplifying
x = 3

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