15a - 3b + 8a - 4a -3*6b +b = 19a - 20b
b: -3b -18b + b = -21b +b = -20b
a: 15a + 8a - 4a = 23a - 4a = 19a
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15a - 3b + 8a - 4a -3*6b +b = 19a - 20b
b: -3b -18b + b = -21b +b = -20b
a: 15a + 8a - 4a = 23a - 4a = 19a
Verified answer
15а-3в+8а-4а-3*6в+в=19а-22в