помогите решить уровнения, пример:
а) x + 11,5= 10,5        х-1,8=2,8
б)5+3х = 8                  4х + 7=11
в)6х + 7-2х = 3            5х + 4 - 3х= 8
г) 4:х= 2:25                  60:5= 1,2:х

( 1,3 - 2 целых 1/4: 0,9) * (-10) -13
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