14х-х-28=167
13х=167+28
13х=195
х=195/13
х=15
8a+7a+15=420
15a=420-15
15a=405
a=405/15
a=27
16y-7y+38=3683
9y=3683-38
9y=3645
y=3645/9
y=405
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14х-х-28=167
13х=167+28
13х=195
х=195/13
х=15
8a+7a+15=420
15a=420-15
15a=405
a=405/15
a=27
16y-7y+38=3683
9y=3683-38
9y=3645
y=3645/9
y=405