(3,7+х)/2=2,15
3,7+х=2,15*2
3,7+х=4,3
х=4,3-3,7
х=0,6
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(3,7+х)/2=2,15
3,7+х=2,15*2
3,7+х=4,3
х=4,3-3,7
х=0,6