Question

(2•d-1)+17=98
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Answer 1

(2•d-1)+17=98
2•d-1=98-17
2•d-1=81
2•d=81-1
2•d=80
d=80:2
d=40

Answer 2

(2•d-1)+17=98;
2d-1=98-17;
2d-1=81;
2d=81+1;
2d=82;
d=82/2;
d=41;