3+4x+5x=-42

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Solution for 3+4x+5x=-42 equation: 


Simplifying
3 + 4x + 5x = -42

Combine like terms: 4x + 5x = 9x
3 + 9x = -42

Solving
3 + 9x = -42

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 + 9x = -42 + -3

Combine like terms: 3 + -3 = 0
0 + 9x = -42 + -3
9x = -42 + -3

Combine like terms: -42 + -3 = -45
9x = -45

Divide each side by '9'.
x = -5

Simplifying
x = -5

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