Решите уравнения: а) 5х+8=7(х+5)-9
б) 3(у+5)-9(у²+5)=3(7-3у²)
в) z²+6z-18=(z-4)²
г) 5a+8(a+6)=7a-10
д) 17b+16-8b=17(b+2)
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