Can someone give me subtracting and adding fractions step by step directions

Step one: common denominators ex. 25/100, 79/100
step two: add the numerators and keep the denominators the same (addition)
step three: biggest fraction first!! subtract the numerators keep the denominators the same (subtraction)
step four: have a nice time with fractions

1/3 + 2/5 = 1+2 = 3 and 3+5= 8 so = 3/8

If it's cross then 1+5= 6 and 2+ 1 = 3 so 6/3

b=-3

Step-by-step explanation:

-11b+7=40

-7         -7

-11b=40-7

-11b=33

-11b/-11=33/-11

b=-3

CHECK:

-11b+7 = 40

Substitute -3 for b:

-11(-3)+7=40

Solve:

33+7=40

40=40

Therefore b does in fact equal -3.

I hope this helped you.

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Have a great day