2,8×0,3=0,84
0,84/0,7=1,2
8-10х+15=13-6х
-10х+6х=13-8-15
-4х=-10
х=10/4
х=2,5
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2,8×0,3=0,84
0,84/0,7=1,2
8-10х+15=13-6х
-10х+6х=13-8-15
-4х=-10
х=10/4
х=2,5