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7x+7(5x-7)=287
We simplify the equation to the form, which is simple to understand
7x+7(5x-7)=287
Reorder the terms in parentheses
7x+(+35x-49)=287
Remove unnecessary parentheses
+7x+35x-49=+287
We move all terms containing x to the left and all other terms to the right.
+7x+35x=+287+49
We simplify left and right side of the equation.
+42x=+336
We divide both sides of the equation by 42 to get x.
x=8
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