СРОЧНО !!!! 1) упростите выражения
a) 7-4d-15+7d-12d-10
б)-5⋅(6-4)+12⋅(k-4)
в)2 1/5⋅(2-1 3/7f)+3/7f

2)решите уравнения
а)3y-3-2y=4
б)-3,3⋅(2f-4)-1^2+8
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