Упростите и решите задачу
7×(0,5а+1)+1,5а-9,а=-0,8
3,5×(3-4b)-5,7+8b,b=1,3
-6(3/2c+1)+7c+5,c=7
0,4(5d-4)-3,4+0,6d d=5
Помогите срочно
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