1.2x + 7 = 17。2.3x - 8 = 16。3.5x - 20 = 3x + 10。4.2(x - 3) = 5x - 2。5.3(2x + 1) - 2(x - 3) = 18。6.x + 3/2 = 7/3。7.3(x - 4) = 2(x + 5) - x。8.3x + 5 = 2x - 10。9.x/2 + 3 = x/3 - 2(x - 6)。10.(x + 3)/6 - (x - 4)/2 = (x + 1)/3。11.- (2x - 3)/6 = (x - 1)/2。12.(x + 1)/3 - (2x - 3)/6 = (x - 1)/2。