Question 60530
The main idea is to get the variable t on one side and the numbers on the other. Add 9t to each side to elimate the t's from the left of the equation
{{{8-9t=21t-17}}}Add 9t to each side to elimate the t's from the left of the equation
{{{8-9t+9t=21t-17+9t}}}
{{{8=30t-17}}}
{{{8+17=30t-17+17}}} Add 17 to each side to eliminate the 17 on the right hand side of the equation 
{{{25=30t}}} Divide each side by 30 to eliminate all numbers on the right hand side of the equation
{{{25/30=30t/30}}}
{{{5/6=t}}}