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8x+30+2x-66=3x+39+4x+63
We move all terms to the left:
8x+30+2x-66-(3x+39+4x+63)=0
We add all the numbers together, and all the variables
8x+2x-(7x+102)+30-66=0
We add all the numbers together, and all the variables
10x-(7x+102)-36=0
We get rid of parentheses
10x-7x-102-36=0
We add all the numbers together, and all the variables
3x-138=0
We move all terms containing x to the left, all other terms to the right
3x=138
x=138/3
x=46
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