can someone tell me what i did wrong

It keeps saying

Cannot implicitly convert type 'long' to 'int'. An explicit conversion exists (are you missing a cast?)

int lVar10 = 0x7a69;
int uVar12 = lVar10 * 0x1a3 + 0x181d;
lVar10 = uVar12 + ((uVar12 & 0xffffffff) / 0x7262) * -0x7262;

In short, the numbers you are trying to operate are bigger than the highest possible int value, specifically at the row

lVar10 = uVar12 + ((uVar12 & 0xffffffff) / 0x7262) * -0x7262;

In decimal that number is 2147483647 = 2^31 - 1. Since you are using hexa to represent numbers (with the prefix 0x), the 0xffffffff alone is already bigger than the highest integer.

So you could fix this by declaring lVar10 and lVar12 as long.