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3-((1/5)*(-4*x-15)) = 0
(-1/5)*(-4*x-15)+3 = 0
3-1/5*(-4*x-15) = 0
3-1/5*(-4*x-15) = 0
4/5*x+6 = 0
4/5*x+6 = 0
4/5*x+6 = 0 // - 6
4/5*x = -6 // : 4/5
x = -6/4/5
x = -15/2
x = -15/2
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