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15x-45+12x-15=0
We simplify the equation to the form, which is simple to understand
15x-45+12x-15=0
We move all terms containing x to the left and all other terms to the right.
+15x+12x=0+45+15
We simplify left and right side of the equation.
+27x=+60
We divide both sides of the equation by 27 to get x.
x=2.2222222222222
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