6x-3+4x+8-15=5x+5+35
10x-10=5x+40
5x=50
x=10
6x - 3 + 4x + 8 - 15 = 5x + 5 + 35
10x - 10 = 5x + 40
10x - 5x = 40 + 10
5x = 50
5x = 50 / 5
x = 10.