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0.8x+7=0.75(10+x)
We move all terms to the left:
0.8x+7-(0.75(10+x))=0
We add all the numbers together, and all the variables
0.8x-(0.75(x+10))+7=0
We calculate terms in parentheses: -(0.75(x+10)), so:We get rid of parentheses
0.75(x+10)
We multiply parentheses
0.75x+7.5
Back to the equation:
-(0.75x+7.5)
0.8x-0.75x-7.5+7=0
We add all the numbers together, and all the variables
0.05x-0.5=0
We move all terms containing x to the left, all other terms to the right
0.05x=0.5
x=0.5/0.05
x=10
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