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z in (-oo:+oo)
4-((3*z)/7) = 13-((3*z)/4) // - 13-((3*z)/4)
(3*z)/4-((3*z)/7)-13+4 = 0
(-3/7)*z+(3*z)/4-13+4 = 0
9/28*z-9 = 0 // + 9
9/28*z = 9 // : 9/28
z = 9/9/28
z = 28
z = 28
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