(32-7n)+(64+17n)=19-(6n-13)

(32-7n)+(64+17n)=19-(6n-13)

32-7n+64+17n=19-6n+13

17n-7n+6n=19+13-32-64 

16n= -64

n=-64:16

n=- 4

================================== 

(32-7n) +(64+17n) = 19-(6n- 13)

32-7n+64+17n=19-6n+13

96+10n=32-6n

10n+6n=32-96

16n=-64

n=-64/16

n=-4