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x in (-oo:+oo)
x = (1770-(50*y))/35 // - (1770-(50*y))/35
x-((1770-(50*y))/35) = 0
x-((1770-50*y)/35) = 0
(-1*(1770-50*y))/35+x = 0
(-1*(1770-50*y))/35+(35*x)/35 = 0
35*x-1*(1770-50*y) = 0
35*x+50*y-1770 = 0
(35*x+50*y-1770)/35 = 0
(35*x+50*y-1770)/35 = 0 // * 35
35*x+50*y-1770 = 0
35*x+50*y-1770 = 0 // - 50*y-1770
35*x = -(50*y-1770) // : 35
x = (-(50*y-1770))/35
x = (1770-(50*y))/35
x = (1770-(50*y))/35
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