Решить уравнения:
1) 9*b+6*b - 15 = 615
2) 2*a+123*a+97 = 472
3) 1728:(56 - x) = 36
1) 9*b+6*b - 15 = 615
2) 2*a+123*a+97 = 472
3) 1728:(56 - x) = 36
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15b = 615 +15
15b = 630 /:15
b = 42
2) 2*a+123*a+97 = 472
125a = 472 - 97
125a = 375 /:125
а = 3
3) 1728:(56 - x) = 36
1728 = 36 * (56 - х)
1728 = 2016 - 36х
36х = 2016 - 1728
36х = 288 /:36
х = 8