Răspuns :
x+43grade29'41''=90grade
x=89grade59'60''-43grade29'41''
x=(89grade-43grade)+(59'-29')+(60''-41'')
x=46grade30'19''
x=89grade59'60''-43grade29'41''
x=(89grade-43grade)+(59'-29')+(60''-41'')
x=46grade30'19''