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21+42+29+x+(x-10)+(x-20)+(x+14)=360
We move all terms to the left:
21+42+29+x+(x-10)+(x-20)+(x+14)-(360)=0
We add all the numbers together, and all the variables
x+(x-10)+(x-20)+(x+14)-268=0
We get rid of parentheses
x+x+x+x-10-20+14-268=0
We add all the numbers together, and all the variables
4x-284=0
We move all terms containing x to the left, all other terms to the right
4x=284
x=284/4
x=71
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