решите плиз.
а)-19*(2-х)+20
б)16*(7-а)-80
в)-15*(х+4)+60
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а)-35-12(b-3)
б)-18+8(4-х)
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а)-(7-х)+4(х-5)
б)-9(у-4)-(12+у)

даю 15 баллов! плиз решите
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