Помогите решить!По алгебре и как решать!Очень срочно 7x+15=6x+17
20a+42=97-2a
-4x+43=12x-13
-5.8+2b=14b-5.8
0.7-0.5x=-1.8-0.5x
1/3x+1=1/6x+6
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