5x + 15 = 15 + 25 + 35
=> 5x + 15 = 40 + 35
=> 5x + 15 = 75
=> 5x = 60
=> x= 12
5x + 15 = 15 + 25 + 35
5x + 15 = 75
5x = 75-15
5x = 60
x = 60 : 5 =12
5x+15=15+25+35
5x=15-15+25+35
5x=60
x=60:5
x=12
5x + 15 = 15 + 25 + 35
5x + 15 = 75
5x = 75 - 15
5x = 60
x = 60 : 5
x = 12