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7-(4-x)=15+20x
We simplify the equation to the form, which is simple to understand
7-(4-x)=15+20x
Remove unnecessary parentheses
7-4+1x=15+20x
We move all terms containing x to the left and all other terms to the right.
+1x-20x=+15-7+4
We simplify left and right side of the equation.
-19x=+12
We divide both sides of the equation by -19 to get x.
x=-0.631578947368
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