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2.1x-3.2(4x+8)=11
We move all terms to the left:
2.1x-3.2(4x+8)-(11)=0
We multiply parentheses
2.1x-12.8x-25.6-11=0
We add all the numbers together, and all the variables
-10.7x-36.6=0
We move all terms containing x to the left, all other terms to the right
-10.7x=36.6
x=36.6/-10.7
x=-3+1.8/4.28
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