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12x-(4+5x)=0
We simplify the equation to the form, which is simple to understand
12x-(4+5x)=0
Remove unnecessary parentheses
12x-4-5x=0
We move all terms containing x to the left and all other terms to the right.
+12x-5x=0+4
We simplify left and right side of the equation.
+7x=+4
We divide both sides of the equation by 7 to get x.
x=0.57142857142857
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