x = -$75/9$ - $-51/6$
x = -8/9 + 31/6
x = -$8/9$ + $31/6$ * $3/3$
x = -$8/9$ + 93/18
x = -$16/18$ + 93/18
x = 77/18
x = 4 5/9

$-14.35$ - $-53.5$ - 21.3 - 16 3/20
= 39.15 - 21.3 - 21.3 - 16 3/20
= 39.15 - 58.6 - 16 3/20
= -19.45 - 16 3/20
= -19.45 - $1915/20$
= -19.45 - 19.75
= -39.2

$11/12$ + 3.75 - $-x$ = 4.5
1 + 1/12 + 3.75 + x = 4.5
1 + 1/12 + 3.75 + x = 9/2
1 + 1/12 + 45/12 + x = 9/2
$1+1+45+12x$/12 = 9/2
$47+12x$/12 = 9/2
47 + 12x = 54
12x = 7
x = 7/12
x = 0.58333333333