Question 890412
{{{ y = 70 - 7w }}}
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Check:
after the first week, you owe:
{{{ y = 70 - 7*1 }}}
{{{ y = 63 }}}
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After the second week, you owe:
{{{ y = 70 - 7*2 }}}
{{{ y = 56  }}}
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Looks OK