Help please?

Balance the following equations below:
Br2 (l) + I2 (s) ---> IBr3 (g)
NaOH (s) + CO2 (g) ---> Na2CO3 (s) + H2O (l)
C2H2 (g) + O2 (g) ---> CO2 (g) + H2O (g)

Answer:
Just stick in the numbers in front (too lazy to type the letters)
they're in the order you put them

3+1-->2
2+1-->1+1
2+5-->4+2
3Br2 + I2 -> 2IBr3

2NaOH + CO2 -> Na2CO3 + H2O

C2H2 + 2.5O2 -> 2CO2 + H2O

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