Question: Tick (✓) the correct answer:
If 3(t − 3) = 5(2t + 1), then t = ?
(a) −2
(b) 2
(c) −3
(d) 3
Solution:
(a) −2
$3(t-3)=5(2 t+1)$
$\Rightarrow 3 t-9=10 t+5$
$\Rightarrow 3 t-10 t=9+5$
$\Rightarrow-7 t=14$
$\Rightarrow-t=\frac{14}{7}=2$
$\Rightarrow t=-2$