15 (13х - 7)=285
13х-7=285:15
13х-7=19
13х=19+7
13х=26
х=26:13
х=2
______________________________
15 (13*2 -7)=285
15 (26-7)=285
15*19=285
285=285
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15 (13х - 7)=285
13х-7=285:15
13х-7=19
13х=19+7
13х=26
х=26:13
х=2
______________________________
15 (13*2 -7)=285
15 (26-7)=285
15*19=285
285=285