3x+4x-42=42

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Solution for 3x+4x-42=42 equation:


Simplifying
3x + 4x + -42 = 42

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

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

Solving
-42 + 7x = 42

Solving for variable 'x'.

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

Add '42' to each side of the equation.
-42 + 42 + 7x = 42 + 42

Combine like terms: -42 + 42 = 0
0 + 7x = 42 + 42
7x = 42 + 42

Combine like terms: 42 + 42 = 84
7x = 84

Divide each side by '7'.
x = 12

Simplifying
x = 12

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