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x-9+4x+6=12
We simplify the equation to the form, which is simple to understand
x-9+4x+6=12
We move all terms containing x to the left and all other terms to the right.
+1x+4x=+12+9-6
We simplify left and right side of the equation.
+5x=+15
We divide both sides of the equation by 5 to get x.
x=3
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