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10 questions
1+?=81+?=81+?=8
14−?=614-?=614−?=6
?+2=10?+2=10?+2=10
?−3=6?-3=6?−3=6
9+?=139+?=139+?=13
15−?=315-?=315−?=3
?+0=4?+0=4?+0=4
?−10=10?-10=10?−10=10
12+?=1712+?=1712+?=17
11−?=211-?=211−?=2
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