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-3x - 5x = 72
We simplify the equation to the form, which is simple to understand
-3x-5x=72
We move all terms containing x to the left and all other terms to the right.
-3x-5x=+72
We simplify left and right side of the equation.
-8x=+72
We divide both sides of the equation by -8 to get x.
x=-9
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