8x+4x=-18

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Solution for 8x+4x=-18 equation: 


Simplifying
8x + 4x = -18

Combine like terms: 8x + 4x = 12x
12x = -18

Solving
12x = -18

Solving for variable 'x'.

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

Divide each side by '12'.
x = -1.5

Simplifying
x = -1.5

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