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x in (-oo:+oo)
(-3/10)*(x-200) = (1/5)*(x+50)+(-1/2)*x // - (1/5)*(x+50)+(-1/2)*x
(-3/10)*(x-200)-((1/5)*(x+50))-((-1/2)*x) = 0
(-3/10)*(x-200)+(-1/5)*(x+50)+(1/2)*x = 0
x/2-3/10*(x-200)-1/5*(x+50) = 0
(-3/10*2*(x-200))/2+(-1/5*2*(x+50))/2+x/2 = 0
x-3/10*2*(x-200)-1/5*2*(x+50) = 0
x-x+100 = 0
100 = 0
100/2 = 0
100/2 = 0 // * 2
100 = 0
x belongs to the empty set
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