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-15=9x+5-4x
We simplify the equation to the form, which is simple to understand
-15=9x+5-4x
We move all terms containing x to the left and all other terms to the right.
-9x+4x=+5+15
We simplify left and right side of the equation.
-5x=+20
We divide both sides of the equation by -5 to get x.
x=-4
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