1.упромтите выражения: -6(9а+2b)+4(a-7b);  9(4х-5у)-3(11х-у)

2.решите уравнения: 7(4-3х)-(18,5-х)=4-3(х-8);  5(2х-3)-2(3-2х)=15-6(х+1)

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