Add or subtract as indicated:

a. 5.80*10^9s + 3.20*10^8s

b. 4.87*10^-6m - 1.93*10^-6m

c. 3.14*10^-5kg + 9.36*10^-5kg

d. 8.12*10^7g - 6.20*10^6g

How do I solve these?

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