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0=80x-(1000+70x)
We move all terms to the left:
0-(80x-(1000+70x))=0
We add all the numbers together, and all the variables
-(80x-(70x+1000))+0=0
We add all the numbers together, and all the variables
-(80x-(70x+1000))=0
We calculate terms in parentheses: -(80x-(70x+1000)), so:We get rid of parentheses
80x-(70x+1000)
We get rid of parentheses
80x-70x-1000
We add all the numbers together, and all the variables
10x-1000
Back to the equation:
-(10x-1000)
-10x+1000=0
We move all terms containing x to the left, all other terms to the right
-10x=-1000
x=-1000/-10
x=+100
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