Решите уравнения: 1) b + a * x = c
2) 407 + x * 3 = 1080
3) 560 : у = 14
4) х * 30 = 330
5) 2у + 50 = у * 3 + 30
6) х : 74 = 8
7) х * 4 - 5 = х * 3
8) 20 * х = 10
9) 5 - х = 7
10) 461 - х = 102
11) m - x : а = с
12) у - 30 = 330
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