$= 2.2a +1.7b$
Work Step by Step
1) We rearrange the order to group like terms, and then we simplify by adding like terms: $1.4a-1.9b+0.8a+3.6b$ $(1.4a + 0.8a) + (- 1.9b + 3.6b)$ $= 2.2a +1.7b$
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