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5x =3-9
x =-6/5
x= -1,2
-7x+15=3x+12
-10x = -3
x =0,3
6x+7=2x+15
4x = 8
x = 2
9+3x=5x+2
7 = 2x
3.5 = x
6x+7x=15+29
13x = 44
x = 44/13
6x+29x=13-12+3x
32x = 1
x = 1/32
2x+9=13x+29
20 = 11x
20/11 = x