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x in (-oo:+oo)
x = (75-(3*y))/2 // - (75-(3*y))/2
x-((75-(3*y))/2) = 0
x-((75-3*y)/2) = 0
(-1*(75-3*y))/2+x = 0
(-1*(75-3*y))/2+(2*x)/2 = 0
2*x-1*(75-3*y) = 0
2*x+3*y-75 = 0
(2*x+3*y-75)/2 = 0
(2*x+3*y-75)/2 = 0 // * 2
2*x+3*y-75 = 0
2*x+3*y-75 = 0 // - 3*y-75
2*x = -(3*y-75) // : 2
x = (-(3*y-75))/2
x = (75-(3*y))/2
x = (75-(3*y))/2
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