if the texting portion of your plan for $15 a month and you said 500 text messages in a month how much does it cost per text
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f(0)=3*0-5=-5
3x-5=0
3x=5
x=5/3
=====================================================
f(0)=3*0-5=-5
3x-5=0
3x=5
x=5/3
=====================================================