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45-10+7x-3x=8x+2x-9+20
We simplify the equation to the form, which is simple to understand
45-10+7x-3x=8x+2x-9+20
We move all terms containing x to the left and all other terms to the right.
+7x-3x-8x-2x=-9+20-45+10
We simplify left and right side of the equation.
-6x=-24
We divide both sides of the equation by -6 to get x.
x=4
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