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15A + 15B = 18.750 |×3
70A + 45B = 75.000
45A + 45B = 56.250
_______________-
25A = 18.750
A = 830
15A + 15B = 18.750
15×830 + 15B = 18750
15B = 18750 - 12.450
15B = 630
B = 630/15
B = 42