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4x+66=10x+12x=
We move all terms to the left:
4x+66-(10x+12x)=0
We add all the numbers together, and all the variables
4x-(+22x)+66=0
We get rid of parentheses
4x-22x+66=0
We add all the numbers together, and all the variables
-18x+66=0
We move all terms containing x to the left, all other terms to the right
-18x=-66
x=-66/-18
x=3+2/3
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