Answer:
17/20 or 0.85
Explanation:
3/4+4/5-7/10=x
convert to have common denominators
15/20+16/20-14/20=x
17/20=x
3/4=0.75
4/5=0.8
7/10=0.7
0.75+0.8=1.55
1.55-0.7=0.85
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