I am thinking of a number. I multiply it by 8 and add 15. I get the same answer if I multiply by 2 and add 81.

Answer 1

my number is x

result1 = 8x + 15
result2 = 2x + 81

so 8x + 15 = 2x + 81

can you solve this equation ?

test your answer.

Answer 2

8x+15=2x+81
8x-2x=81-5
6x=66
x=66/6
x=11