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(7/17)*x+4 = (1/17)*x-12 // - (1/17)*x-12
(7/17)*x-((1/17)*x)+4+12 = 0
(7/17)*x+(-1/17)*x+4+12 = 0
6/17*x+16 = 0 // - 16
6/17*x = -16 // : 6/17
x = -16/6/17
x = -136/3
x = -136/3
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