Question

15) 8х – 10 = 6х + 20
16) 17х -1 = 15 +16х
17) 19 + 3х = 5х – 15
18) 6 +2х = 4х – 30

Answer 1

$15) \: \: 8x - 10 = 6x + 20 \\ 8x - 6x = 20 + 10 \\ 2x = 30 \\ x = 15 \\ \\ 16) \: \: 17x - 1 = 15 + 16x \\ 17x - 16x = 15 + 1 \\ x = 16 \\ \\ 17) \: \: 19 + 3x = 5x - 15 \\ 3x - 5x = - 15 - 19 \\ - 2x = - 34 \\ x = 17 \\ \\ 18) \: \: 6 + 2x = 4x - 30 \\ 2x - 4x = - 30 - 6 \\ - 2x = - 36 \\ x = 18$