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x in (-oo:+oo)
(2/5)*(5*x-15) = -14 // + 14
(2/5)*(5*x-15)+14 = 0
2/5*(5*x-15)+14 = 0
2/5*(5*x-15)+14 = 0
2*x+8 = 0
2*x+8 = 0
2*x+8 = 0 // - 8
2*x = -8 // : 2
x = -8/2
x = -4
x = -4
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