help with this question ? the steps on finding the answer ?!! :)

4t+7-t=19
4t+7-7-t=19
4t-t=19 (at this point, +7-7 cancells out)
4t-t=19-7
3t=12 (at this point, 3t/3 & 3 cancells out and t is left) and 12 is now 12/3=4
t=4
 
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