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2x+30=1.50x+12=3
We move all terms to the left:
2x+30-(1.50x+12)=0
We get rid of parentheses
2x-1.50x-12+30=0
We add all the numbers together, and all the variables
0.5x+18=0
We move all terms containing x to the left, all other terms to the right
0.5x=-18
x=-18/0.5
x=-36
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