Can anyone explain and give the answer to me?

- 3

Step-by-step explanation:

Given

= ( cross- multiply )

2(a + b) = a - b

2a + 2b = a - b ( subtract a from both sides )

a + 2b = - b ( subtract 2b from both sides )

a = - 3b ( divide both sides by b )

= - 3

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.

49%

step-by-step explanation:

when you realize that you dont know just realize i just took a test and im so smart