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(-4/5)*x+3/5 = (-7/3)*x-4 // - (-7/3)*x-4
(-4/5)*x-((-7/3)*x)+3/5+4 = 0
(-4/5)*x+(7/3)*x+3/5+4 = 0
23/15*x+23/5 = 0 // - 23/5
23/15*x = -23/5 // : 23/15
x = -23/5/23/15
x = -3
x = -3
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