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(-2/10)*(-x-40) = 2*((1/10)*x-4) // - 2*((1/10)*x-4)
(-2/10)*(-x-40)-(2*((1/10)*x-4)) = 0
(-2/10)*(-x-40)-2*((1/10)*x-4) = 0
-1/5*(-x-40)-2*(1/10*x-4) = 0
-1/5*(-x-40)-2*(1/10*x-4) = 0
16 = 0
16 = 0
x belongs to the empty set
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