(2t-2)*(5t+3)-(3t-1)*(3t+2)=-4
10t^2+6t-10t-6-(9t^2+6t-3t-2)=-4
10t^2+6t-10t-6-(9t^2+3t-2)=-4
10t^2+6t-10t-6-9t^2-3t+2=-4
t^2-7t-4=-4
t^2-7t=0
t(t-7)=0
t=0 t-7=0
t=7
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Answers & Comments
(2t-2)*(5t+3)-(3t-1)*(3t+2)=-4
10t^2+6t-10t-6-(9t^2+6t-3t-2)=-4
10t^2+6t-10t-6-(9t^2+3t-2)=-4
10t^2+6t-10t-6-9t^2-3t+2=-4
t^2-7t-4=-4
t^2-7t=0
t(t-7)=0
t=0 t-7=0
t=7