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y in (-oo:+oo)
(7*(y-7))/4 = -3*y // + -3*y
(7*(y-7))/4-(-3*y) = 0
(7*(y-7))/4+3*y = 0
(7*(y-7))/4+(3*4*y)/4 = 0
7*(y-7)+3*4*y = 0
19*y-49 = 0
(19*y-49)/4 = 0
(19*y-49)/4 = 0 // * 4
19*y-49 = 0
19*y-49 = 0 // + 49
19*y = 49 // : 19
y = 49/19
y = 49/19
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