Раскройте скобки и упростите выражение
а)4 * (5-у) -30
б)-8 * (9+х) +50
в)-12 * (-а-2) -10
г)-19 *(2-х) +20
д)16 * (7-а) -90
е)-15 * (х+4) +60
Заранее спасибо
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