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Johanna is planting tomatoes in the school garden this year. Tomato plants come in packs of . She needs plants in the garden and already has . How many packs of plants will she need?  

Write an equation to represent this situation.

For each pack Johanna will gain more tomato plants, so we need to multiply each pack by . She already has tomato plants and she needs .

In equation form:

is the number of packs of plants.

Solve for . Round up to the nearest whole pack.