If you know the starting value and the change (how much was added or taken away), the result is found by addition: start+Δ. A positive change increases the value; a negative change decreases it.
result=start+Δ
Δ>0 — increase; Δ<0 — decrease
On the number line: move from start by ∣Δ∣ in the sign’s direction
Start + change
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