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18x+30=12x+20
We move all terms to the left:
18x+30-(12x+20)=0
We get rid of parentheses
18x-12x-20+30=0
We add all the numbers together, and all the variables
6x+10=0
We move all terms containing x to the left, all other terms to the right
6x=-10
x=-10/6
x=-1+2/3
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