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12x+18x=2(40)+10
We move all terms to the left:
12x+18x-(2(40)+10)=0
We add all the numbers together, and all the variables
12x+18x-250=0
We add all the numbers together, and all the variables
30x-250=0
We move all terms containing x to the left, all other terms to the right
30x=250
x=250/30
x=8+1/3
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