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2x+11+12x+9=90
We simplify the equation to the form, which is simple to understand
2x+11+12x+9=90
We move all terms containing x to the left and all other terms to the right.
+2x+12x=+90-11-9
We simplify left and right side of the equation.
+14x=+70
We divide both sides of the equation by 14 to get x.
x=5
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