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30x+30=33x-210
We move all terms to the left:
30x+30-(33x-210)=0
We get rid of parentheses
30x-33x+210+30=0
We add all the numbers together, and all the variables
-3x+240=0
We move all terms containing x to the left, all other terms to the right
-3x=-240
x=-240/-3
x=+80
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