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-90=-6(7x+8)
We simplify the equation to the form, which is simple to understand
-90=-6(7x+8)
Reorder the terms in parentheses
-90=+(-42x-48)
Remove unnecessary parentheses
-90=-42x-48
We move all terms containing x to the left and all other terms to the right.
+42x=-48+90
We simplify left and right side of the equation.
+42x=+42
We divide both sides of the equation by 042 to get x.
x=1
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