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1390=-10(-3-8x)
We move all terms to the left:
1390-(-10(-3-8x))=0
We add all the numbers together, and all the variables
-(-10(-8x-3))+1390=0
We calculate terms in parentheses: -(-10(-8x-3)), so:We get rid of parentheses
-10(-8x-3)
We multiply parentheses
80x+30
Back to the equation:
-(80x+30)
-80x-30+1390=0
We add all the numbers together, and all the variables
-80x+1360=0
We move all terms containing x to the left, all other terms to the right
-80x=-1360
x=-1360/-80
x=+17
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