найдите значение выражения
45x+26x+17x-78x при x=16
118x-56x+35x+27x при x=3
83y-35y+16y+36y при y=2
16*5y+14*2y-100y при y=6
Решите уравнение
84a+25a+7=443
4(9+7x)+21=393
486:(5x+2)=18
5(14+b)+6b=158
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