Mathematics, 05.04.2021 19:50, pcartei

Rubi charges each family that she babysits a flat fee of $20 for the night and an extra $7 per child. She makes a total of $90. Write a two-step
equation that would show how many children she babysat.

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Rubi charges each family that she babysits a flat fee of $20 for the night and an extra $7 per chil...