(A)0.8(2x+x)+3(7-4.1x)=x+21

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Solution for (A)0.8(2x+x)+3(7-4.1x)=x+21 equation: 



()0.8(2A+A)+3(7-4.1A)=A+21

We move all terms to the left:

()0.8(2A+A)+3(7-4.1A)-(A+21)=0

We add all the numbers together, and all the variables

()0.8(+3A)+3(-4.1A+7)-(A+21)=0

We multiply parentheses

()0.8(+3A)-12A-(A+21)+21=0

We get rid of parentheses

()0.8(+3A)-12A-A-21+21=0

We add all the numbers together, and all the variables

-13A+()0.8(+3A)=0

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