3x+7=2(x+6)
3x+7=2x+12
3x-2x=12-7
x=5
7{x+6}-3x=4{2x+5}
7{x+6}-3x=4{2x+5}
7x+42-3x=8x+20
4x+42=8x+20
42-20=8x-4x
22=4x
x=5.5
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