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(-12-7x)(4)=0
We simplify the equation to the form, which is simple to understand
(-12-7x)*(4)=0
Reorder the terms in parentheses
multiplication of parentheses
(-48-28x)=0
Remove unnecessary parentheses
-48-28x=0
We move all terms containing x to the left and all other terms to the right.
-28x=0+48
We simplify left and right side of the equation.
-28x=+48
We divide both sides of the equation by -28 to get x.
x=-1.7142857142857
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