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x in (-oo:+oo)
(-4/5)*(5/4-(5*x)) = 5-14 // - 5-14
(-4/5)*(5/4-(5*x))-5+14 = 0
(-4/5)*(5/4-5*x)-5+14 = 0
14-4/5*(5/4-5*x)-5 = 0
14-4/5*(5/4-5*x)-5 = 0
4*x-6+14 = 0
4*x+8 = 0
4*x+8 = 0
4*x+8 = 0 // - 8
4*x = -8 // : 4
x = -8/4
x = -2
x = -2
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