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u in (-oo:+oo)
4*((-1/4)*u+5/2) = 4*((7/2)*u+7/2) // - 4*((7/2)*u+7/2)
4*((-1/4)*u+5/2)-(4*((7/2)*u+7/2)) = 0
4*((-1/4)*u+5/2)-4*((7/2)*u+7/2) = 0
4*(5/2-1/4*u)-4*(7/2*u+7/2) = 0
4*(5/2-1/4*u)-4*(7/2*u+7/2) = 0
-15*u-4 = 0
-15*u-4 = 0
-15*u-4 = 0 // + 4
-15*u = 4 // : -15
u = 4/(-15)
u = -4/15
u = -4/15
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