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9=4x-7x+15
We simplify the equation to the form, which is simple to understand
9=4x-7x+15
We move all terms containing x to the left and all other terms to the right.
-4x+7x=+15-9
We simplify left and right side of the equation.
+3x=+6
We divide both sides of the equation by 3 to get x.
x=2
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