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2-7x+100-10x=86-21x
We move all terms to the left:
2-7x+100-10x-(86-21x)=0
We add all the numbers together, and all the variables
-7x-10x-(-21x+86)+2+100=0
We add all the numbers together, and all the variables
-17x-(-21x+86)+102=0
We get rid of parentheses
-17x+21x-86+102=0
We add all the numbers together, and all the variables
4x+16=0
We move all terms containing x to the left, all other terms to the right
4x=-16
x=-16/4
x=-4
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