Решить уравнения. 99 Баллов. 1) 0,5 + x + ( x- 0,25)= 0,75
2) 3,4 : x=5,1 : 3
3) (2a - 4) + 7,5= a + 4,55
4) x + 24,1 = 3х - 17,1
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