Ответ:
-x+(-9)=-72
-x-9=-72
-x=-72+9
-x=-63
x=63
y-(-5 2/3)=-3 1/4
y+5 2/3=13/14
y+17/3=13/14
y=13/14-17/3
y=-29/12=-2 5/12
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Ответ:
-x+(-9)=-72
-x-9=-72
-x=-72+9
-x=-63
x=63
y-(-5 2/3)=-3 1/4
y+5 2/3=13/14
y+17/3=13/14
y=13/14-17/3
y=-29/12=-2 5/12