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3(x+y)+4(x+5) помогите пожауйста!...
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2(4a+7)+5a         a=3...
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17(3c+5d)+6c-28d=              c+d=2...
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14y+33y-45y    y=17...
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18n+34n-22n=        n=6...
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52m-25m+45m=               m=9...
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вычислите продукт реакции: H2 S= ответы...
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8*(2x+5)+4*(6+7x)=                             x=3...
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52+4(11+b)=.               B=6...
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8(7+3b)-31=    b=2...
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