(7х + 2) / 3 = (8х - 1) / 5
5(7х + 2) = 3 ( 8х - 1)
35х + 10 = 24х - 3
35х - 24х = -10 - 3
11х = - 13
х = - 1цел.2/11
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(3 - 3у) / 4 = (5 - 2у /3
3( 3 - 3у) = 4(5 - 2у)
9 - 9у = 20 - 8у
-9у + 8у = 20 - 9
х = - 11
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4 / (2у - 5) = 5 /(у -7)
5(2у -5) = 4 (у +7)
10у - 25 = 4у = 28
10у - 4у = 25 + 29
6у = 54
у = 9