-х-4+5х+15= -5-5х-2
11+4х= -7-5х
4х+5х= -7-11
9х= -18
х= -18:9
х= -2
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-х-4+5х+15= -5-5х-2
11+4х= -7-5х
4х+5х= -7-11
9х= -18
х= -18:9
х= -2