Sal is trying to determine which cell phone and service plan to buy for his mother. The first phone costs $100 and $55 per month for unlimited usage. The second phone costs $150 and $51 per month for unlimited usage. How many months will it take for the second phone to be less expensive than the first phone?

1st:   100+55x>150+51x

2nd:  x>12.5

3rd:   13

Step-by-step explanation:

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step-by-step explanation:

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