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7+2x+x=12x+20+41
We move all terms to the left:
7+2x+x-(12x+20+41)=0
We add all the numbers together, and all the variables
2x+x-(12x+61)+7=0
We add all the numbers together, and all the variables
3x-(12x+61)+7=0
We get rid of parentheses
3x-12x-61+7=0
We add all the numbers together, and all the variables
-9x-54=0
We move all terms containing x to the left, all other terms to the right
-9x=54
x=54/-9
x=-6
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