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(3/5)*x+10 = 189/20 // - 189/20
(3/5)*x-(189/20)+10 = 0
(3/5)*x-189/20+10 = 0
3/5*x+11/20 = 0 // - 11/20
3/5*x = -11/20 // : 3/5
x = -11/20/3/5
x = -11/12
x = -11/12
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