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90=(5x-7)+(2x+6)
We simplify the equation to the form, which is simple to understand
90=(5x-7)+(2x+6)
Remove unnecessary parentheses
90=5x-7+(2x+6)
Remove unnecessary parentheses
+90=+5x-7+2x+6
We move all terms containing x to the left and all other terms to the right.
-5x-2x=-7+6-90
We simplify left and right side of the equation.
-7x=-91
We divide both sides of the equation by -7 to get x.
x=13
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