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15x+4x-2x=14+15-12
17x=17
x=1 :VVVVVVVVVVVVVVVVVVV
15x-15+4x+12 = 14+2x
19x -3 = 14+ 2x
19x-2x = 14 + 3
17x = 17
x = 17/17
x = 1