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2x+4(14+2x)=21
We move all terms to the left:
2x+4(14+2x)-(21)=0
We add all the numbers together, and all the variables
2x+4(2x+14)-21=0
We multiply parentheses
2x+8x+56-21=0
We add all the numbers together, and all the variables
10x+35=0
We move all terms containing x to the left, all other terms to the right
10x=-35
x=-35/10
x=-3+1/2
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