Решите уравнение: а) -4(3a+5)+2a=15
б) 4,5(-2a+4)-a=8
в) -3,4a-(2a+4)=23
г) -8-3(a-5)=9
д) 3x-2(x+4)=12
е) 5x+8(x-4)=7
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