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4(2.1x+1.25)=21.8
We move all terms to the left:
4(2.1x+1.25)-(21.8)=0
We add all the numbers together, and all the variables
4(2.1x+1.25)-21.8=0
We multiply parentheses
8x+5-21.8=0
We add all the numbers together, and all the variables
8x-16.8=0
We move all terms containing x to the left, all other terms to the right
8x=16.8
x=16.8/8
x=2+0.8/8
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