addition
four more than twice a number is 12
2x+4=12
nine less than six times a number is 15
6a-9=15
2x+4=12
4
eight more than four times a number is 16
4x+8=16
evaluate
if a = 5 and b = 2
ab
10
6x+8=26
x = 3
eight more than six times a number is 26
8+6x=26
the product of 6 and a number decreased by 5 =15
6b-5=15
10+7x=45
x = 5
three more than five times a number is 53
5x+3=53
5 less than a number is 42
a-5=42
5b = 3 =53
b=10
seven more than twice a number is 23
7+2x=23
6 less than three times a number is 55
3f-3=55
6b+9=15
b=1