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2x+5(2.8x-5.4)=21
We move all terms to the left:
2x+5(2.8x-5.4)-(21)=0
We multiply parentheses
2x+10x-27-21=0
We add all the numbers together, and all the variables
12x-48=0
We move all terms containing x to the left, all other terms to the right
12x=48
x=48/12
x=4
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