Who knows how to solve this equation?

Who knows how to solve this equation?

Fang Chengyi
x/10+(12/15)-x=1
Multiply both sides by 30 to get 3x + 24-30x = 30
It is reduced to x = - 2 / 9
Fang Chenger
x/10+12/(15-x)=1
The result is (15-x + 120) / (150-10x) = 1
It is reduced to x = 3 / 5