Is this possible?

I am 5ft 1 and weigh 235 (I'm insanely unhealthy)

I am 23, and I wanna get down to 112-115 area. So that's about 120+ pounds to lose. I wanna do it in 18 months, give or take. Is it possible to do with portion control and eating cleaner? I'm also gonna do cardio and walk. Is this possible to achieve in a year and a half?
Is this possible?
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