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5x-20 < 40+8x
5x+8x < 40+20
13x < 60
x <
10x-1 > 6x+3
10x-6x >3+1
4x > 4
x > 4:4
x > 1
8x-4 - 6x-10 3x-9
8x-6x-10-4 3x-9
2x-14 3x-9
2x-3x -9 + 14
-x 5
x