8.7*2 = 0.5(15+4х)
17,4/0.5=15+4х
4х=34,8
Х= 34,8/4
Х=8.7
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8.7*2 = 0.5(15+4х)
17,4/0.5=15+4х
4х=34,8
Х= 34,8/4
Х=8.7