Question 97068
{{{ p=21+2w }}} Start with the given equation



{{{ p-21=2w }}} Subtract 21 from both sides



{{{ (p-21)/2=w }}} Divide both sides by 2


So w is 


{{{ w=(p-21)/2}}} 






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{{{ 5(x-1)/3=10/2 }}} Start with the given equation



{{{ 5(x-1)/3=5 }}} Reduce



{{{ 5(x-1)=15 }}} Multiply both sides by 3



{{{ 5x-5=15 }}} Distribute



{{{ 5x=20 }}} Add 5 to both sides



{{{ x=4 }}} Divide both sides by 5