Answer:
0.76x - 0.28
Explanation:
m= 0.56x-0.25
n= 0.20x-0.03
m+n= 0.56x-0.25 + 0.20x-0.03 = (0.56+0.20)x - (0.25+0.03)= 0.76x - 0.28
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