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120+x+100+120+120+(x-10)=720
We move all terms to the left:
120+x+100+120+120+(x-10)-(720)=0
We add all the numbers together, and all the variables
x+(x-10)-260=0
We get rid of parentheses
x+x-10-260=0
We add all the numbers together, and all the variables
2x-270=0
We move all terms containing x to the left, all other terms to the right
2x=270
x=270/2
x=135
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