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3+x+81+3x=4x+66+2x+2x
We move all terms to the left:
3+x+81+3x-(4x+66+2x+2x)=0
We add all the numbers together, and all the variables
x+3x-(8x+66)+3+81=0
We add all the numbers together, and all the variables
4x-(8x+66)+84=0
We get rid of parentheses
4x-8x-66+84=0
We add all the numbers together, and all the variables
-4x+18=0
We move all terms containing x to the left, all other terms to the right
-4x=-18
x=-18/-4
x=4+1/2
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