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13=7(1+2x)-5(7x+3)
We simplify the equation to the form, which is simple to understand
13=7(1+2x)-5(7x+3)
Reorder the terms in parentheses
13=+(+7+14x)-5*(7x+3)
Remove unnecessary parentheses
+13=+7+14x-5+*(+7x+3+)
Reorder the terms in parentheses
13=+7+14x+(-35x-15)
Remove unnecessary parentheses
+13=+7+14x-35x-15
We move all terms containing x to the left and all other terms to the right.
-14x+35x=+7-15-13
We simplify left and right side of the equation.
+21x=-21
We divide both sides of the equation by 21 to get x.
x=-1
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