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(4/5)*x+5*x-(4/7) = -912/175 // + -912/175
(4/5)*x+5*x-(4/7)-(-912/175) = 0
(4/5)*x+5*x-4/7+912/175 = 0
29/5*x+116/25 = 0 // - 116/25
29/5*x = -116/25 // : 29/5
x = -116/25/29/5
x = -4/5
x = -4/5
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