Question

3(x-7)+5x, 5-(4-3х)+8х​

Answer 1

$3(x - 7) + 5x = \\ 3x - 21 + 5x = 8x + 21$

$5 - (4 - 3x) + 8x = \\ 5 - 4 + 3x + 8x = 1 + 11x$