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9x-(5x+4)=12
We simplify the equation to the form, which is simple to understand
9x-(5x+4)=12
Remove unnecessary parentheses
9x-5x-4=12
We move all terms containing x to the left and all other terms to the right.
+9x-5x=+12+4
We simplify left and right side of the equation.
+4x=+16
We divide both sides of the equation by 4 to get x.
x=4
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