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5x-(-2x)+20=81
We simplify the equation to the form, which is simple to understand
5x-(-2x)+20=81
Remove unnecessary parentheses
5x+2x+20=81
We move all terms containing x to the left and all other terms to the right.
+5x+2x=+81-20
We simplify left and right side of the equation.
+7x=+61
We divide both sides of the equation by 7 to get x.
x=8.7142857142857
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