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12x+30-40/2=5x+2
We move all terms to the left:
12x+30-40/2-(5x+2)=0
We add all the numbers together, and all the variables
12x-(5x+2)+10=0
We get rid of parentheses
12x-5x-2+10=0
We add all the numbers together, and all the variables
7x+8=0
We move all terms containing x to the left, all other terms to the right
7x=-8
x=-8/7
x=-1+1/7
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