3x+(-15+4x)+15=42

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Solution for 3x+(-15+4x)+15=42 equation: 


Simplifying
3x + (-15 + 4x) + 15 = 42

Remove parenthesis around (-15 + 4x)
3x + -15 + 4x + 15 = 42

Reorder the terms:
-15 + 15 + 3x + 4x = 42

Combine like terms: -15 + 15 = 0
0 + 3x + 4x = 42
3x + 4x = 42

Combine like terms: 3x + 4x = 7x
7x = 42

Solving
7x = 42

Solving for variable 'x'.

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

Divide each side by '7'.
x = 6

Simplifying
x = 6

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