10-(3+5)= 2
(5+5)-8= 2
15-(7+7)= 1
20-(18-8)= 10
(6+6)-(5+4)= 3
(8+9)-10-(10-7)=
20-(7+8)= 5
14-(20-13)=7
10-(3+5)= 2
(5+5)-8= 2
15-(7+7)= 1
20-(18-8)= 10
(6+6)-(5+4)= 3
(8+9)-10-(10-7)=
20-(7+8)= 5
14-(20-13)=7