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y in (-oo:+oo)
45*((7/9)*y+7)-(35*y) = 18 // - 18
45*((7/9)*y+7)-(35*y)-18 = 0
45*((7/9)*y+7)-35*y-18 = 0
45*(7/9*y+7)-35*y-18 = 0
45*(7/9*y+7)-35*y-18 = 0
315-18 = 0
297 = 0
297 = 0
y belongs to the empty set
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