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7x+9-2x=20 + 4x +1
We simplify the equation to the form, which is simple to understand
7x+9-2x=20+4x+1
We move all terms containing x to the left and all other terms to the right.
+7x-2x-4x=+20+1-9
We simplify left and right side of the equation.
+1x=+12
We divide both sides of the equation by 1 to get x.
x=12
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