Question

Упростить выражение :
8x - x + 4x - 2x
2a + 7b + a + 3b
5n + 4 + 12 + n

Answer 1

$8x - x + 4x - 2x = 7x + 2x = \\ = 9x$

$2a + 7b + a + 3b = 3a + 10b$

$5n + 4 + 12 + n = 6n + 16$