Решите уравнения: а) |x|+3x=12
б) |x|-4x=9
в) 2(x-5)-6|x|=-18
г) |2x-5|=|3x+6|
д)9-|7-2t|=2-t
е)|5a+4|=2+|3a-6|
ж)|2y-1|-|y+3|=2
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