78=(15+2x)+x

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Solution for 78=(15+2x)+x equation:


Simplifying
78 = (15 + 2x) + x

Remove parenthesis around (15 + 2x)
78 = 15 + 2x + x

Combine like terms: 2x + x = 3x
78 = 15 + 3x

Solving
78 = 15 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
78 + -3x = 15 + 3x + -3x

Combine like terms: 3x + -3x = 0
78 + -3x = 15 + 0
78 + -3x = 15

Add '-78' to each side of the equation.
78 + -78 + -3x = 15 + -78

Combine like terms: 78 + -78 = 0
0 + -3x = 15 + -78
-3x = 15 + -78

Combine like terms: 15 + -78 = -63
-3x = -63

Divide each side by '-3'.
x = 21

Simplifying
x = 21

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