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(4*x-7)/5 = -3 // + 3
(4*x-7)/5+3 = 0
(4*x-7)/5+(3*5)/5 = 0
4*x+3*5-7 = 0
4*x+8 = 0
(4*x+8)/5 = 0
(4*x+8)/5 = 0 // * 5
4*x+8 = 0
4*x+8 = 0 // - 8
4*x = -8 // : 4
x = -8/4
x = -2
x = -2
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