СРОЧНО!
Упростите выражение:
а) 2(3-6с) - 9(2+3с) + 3(13с-4)
б) -4(2d+5) + 7(2+5d) - (d-6)
в) 16(с-3) + 8(5-2с) - (10с-8)
г) -12(7-2d) - 9(7d-5) - 3(15+8d)



Заранее спасибо!
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