Answer
c=6
Step-by-step explanation:
subtract both sides by ten
c+10-10=40-10
5c=30
divide both sides by 5
5c/5=3-/5
Answer:
1)
2) 
Step-by-step explanation:
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4 + -1 = 3
Or -1 - 4 = -5
I would put 3.