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4(6x+10) = 3x+4
24x + 40 = 3x+4
21 x = -36
x = - 36/21 = -12/7
.
2) 3x- 5 = 3/5 (x+4)
5(3x-5) = 3(x+4)
15x - 25 = 3x +12
12 x = 37
x = 37/12
2x -5 = 2 (37/12) - 5 = 37/6 - 5 = 7/6
.
3) |2x+1| < |2x-3|
(2x+1)^2 < (2x-3)^2
4x^2 + 4x + 1 < 4x^2 - 12 x + 9
4x + 12x < 9-1
16x < 8
x < 1/2