4x-7-(x+1)=3x+4-(2x-1)
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4x - 7 - (x + 1) = 3x + 4 - (2x - 1)
4x - 7 - x - 1 = 3x + 4 - 2x + 1
3x - 8 = x + 5
3x - x = 5 + 8
2x = 13
x = 13/2
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