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-10(-7x-2)=510
We move all terms to the left:
-10(-7x-2)-(510)=0
We multiply parentheses
70x+20-510=0
We add all the numbers together, and all the variables
70x-490=0
We move all terms containing x to the left, all other terms to the right
70x=490
x=490/70
x=7
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