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0.6(x-4.2)=0.4(0.7+x)
We move all terms to the left:
0.6(x-4.2)-(0.4(0.7+x))=0
We add all the numbers together, and all the variables
0.6(x-4.2)-(0.4(x+0.7))=0
We multiply parentheses
0.6x-(0.4(x+0.7))-2.52=0
We calculate terms in parentheses: -(0.4(x+0.7)), so:We get rid of parentheses
0.4(x+0.7)
We multiply parentheses
0.4x+0.28
Back to the equation:
-(0.4x+0.28)
0.6x-0.4x-0.28-2.52=0
We add all the numbers together, and all the variables
0.2x-2.8=0
We move all terms containing x to the left, all other terms to the right
0.2x=2.8
x=2.8/0.2
x=13+0.2/0.2
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