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I want to calculate a discrete log problem on elliptic curves. P and Q are points of order D in elliptic curve formed a basis of E[D] and R is a point of order D. I want to calculate a,b such that aP+bQ=R

I want to calculate a discrete log problem on elliptic curves. P $P$ and Q $Q$ are points of order D $D$ in elliptic curve formed a basis of E[D] $E[D]$, and R $R$ is a point of order D. $D$. I want to calculate a,b $a,b$ such that aP+bQ=R$aP+bQ=R$.