Question 1199679
x, number of tickets in a month


without the pass:  {{{1.5x}}}

with the pass:  {{{0.75x+17.25}}}


Look for the solution of {{{1.5x=0.75x+17.25}}}.


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{{{0.75x=17.25}}}

{{{x=17.25/0.75}}}

{{{x=23}}}