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x=0.3(50+x)
We move all terms to the left:
x-(0.3(50+x))=0
We add all the numbers together, and all the variables
x-(0.3(x+50))=0
We calculate terms in parentheses: -(0.3(x+50)), so:We get rid of parentheses
0.3(x+50)
We multiply parentheses
0.3x+15
Back to the equation:
-(0.3x+15)
x-0.3x-15=0
We add all the numbers together, and all the variables
0.7x-15=0
We move all terms containing x to the left, all other terms to the right
0.7x=15
x=15/0.7
x=21+0.3/0.7
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