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3x+11+5x+1=12x-20
We move all terms to the left:
3x+11+5x+1-(12x-20)=0
We add all the numbers together, and all the variables
8x-(12x-20)+12=0
We get rid of parentheses
8x-12x+20+12=0
We add all the numbers together, and all the variables
-4x+32=0
We move all terms containing x to the left, all other terms to the right
-4x=-32
x=-32/-4
x=+8
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