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13+8(4x-9)=21
We simplify the equation to the form, which is simple to understand
13+8(4x-9)=21
Reorder the terms in parentheses
13+(+32x-72)=21
Remove unnecessary parentheses
+13+32x-72=+21
We move all terms containing x to the left and all other terms to the right.
+32x=+21-13+72
We simplify left and right side of the equation.
+32x=+80
We divide both sides of the equation by 32 to get x.
x=2.5
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