1) 5x + 3y - 2x - 9y = 3х – 6у=3х – 6у
2) 2 * (3a - 4) + 5 = 2 * 3а – 8 + 5 = 6а – 3=6а – 3
3) 15a - (a - 3) + (2a - 1) = 15а – а + 3 + 2а – 1 = 16а + 2=16а + 2
1) 5x + 3y - 2x - 9y = 3х – 6у=3х – 6у
2) 2 * (3a - 4) + 5 = 2 * 3а – 8 + 5 = 6а – 3=6а – 3
3) 15a - (a - 3) + (2a - 1) = 15а – а + 3 + 2а – 1 = 16а + 2=16а + 2