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12x+11=7x+31
We simplify the equation to the form, which is simple to understand
12x+11=7x+31
We move all terms containing x to the left and all other terms to the right.
+12x-7x=+31-11
We simplify left and right side of the equation.
+5x=+20
We divide both sides of the equation by 5 to get x.
x=4
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