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5(4x+1)+10x=21
We move all terms to the left:
5(4x+1)+10x-(21)=0
We add all the numbers together, and all the variables
10x+5(4x+1)-21=0
We multiply parentheses
10x+20x+5-21=0
We add all the numbers together, and all the variables
30x-16=0
We move all terms containing x to the left, all other terms to the right
30x=16
x=16/30
x=8/15
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