To balance chemical equation there r 4 steps 
1)first write chemical formula in words
2)then write the formula
3)check the formula whether the coefficients are correct
4)finnaly verify the formula 
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To balance any chemical equation we can apply 2 methods-
1) Hit & Trial method-
We just have to put any coefficient before any compound & try to equate to opposite side of that element or compond.
2) Algebraic expression method- 
We 1st have to put coefficient a,b,c,d,e........& on till how many componds are given both on left hand side & right hand side.Then we have to put the value of a=1 & with respect to a particular element we have to make an equation.Thus, like this we have to find out all the values of a,b,c,d,e......& on.