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x in (-oo:+oo)
x = (60-(4*y))/7 // - (60-(4*y))/7
x-((60-(4*y))/7) = 0
x-((60-4*y)/7) = 0
(-1*(60-4*y))/7+x = 0
(-1*(60-4*y))/7+(7*x)/7 = 0
7*x-1*(60-4*y) = 0
7*x+4*y-60 = 0
(7*x+4*y-60)/7 = 0
(7*x+4*y-60)/7 = 0 // * 7
7*x+4*y-60 = 0
7*x+4*y-60 = 0 // - 4*y-60
7*x = -(4*y-60) // : 7
x = (-(4*y-60))/7
x = (60-(4*y))/7
x = (60-(4*y))/7
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