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z in (-oo:+oo)
(-4/7)*(2-15)-((1/4)*z) = 0
(-1/4)*z+(-4/7)*(2-15) = 0
52/7-1/4*z = 0 // - 52/7
-1/4*z = -52/7 // : -1/4
z = -52/7/(-1/4)
z = 208/7
z = 208/7
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