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57.5+86.5+86+88+2x+48+30+136=519
We simplify the equation to the form, which is simple to understand
57.5+86.5+86+88+2x+48+30+136=519
We move all terms containing x to the left and all other terms to the right.
+2x=+519-57.5-86.5-86-88-48-30-136
We simplify left and right side of the equation.
+2x=-13
We divide both sides of the equation by 2 to get x.
x=-6.5
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