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3.2x(-2.1)+5.8=0.5x(x)
We move all terms to the left:
3.2x(-2.1)+5.8-(0.5x(x))=0
We add all the numbers together, and all the variables
3.2x(-2.1)-(+0.5xx)+5.8=0
We multiply parentheses
-6.3x-(+0.5xx)+5.8=0
We get rid of parentheses
-6.3x-0.5xx+5.8=0
We move all terms containing x to the left, all other terms to the right
-6.3x-0.5xx=-5.8
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