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OpenStudy (anonymous):
4/7z+ 2/3z= 13
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OpenStudy (anonymous):
(4/7)*z+(2/3)*z = 13 // - 13 (4/7)*z+(2/3)*z-13 = 0 26/21*z-13 = 0 // + 13 26/21*z = 13 // : 26/21 z = 13/26/21 z = 21/2 z = 21/2
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