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-4.5-21t=-1.5
We simplify the equation to the form, which is simple to understand
-4.5-21t=-1.5
We move all terms containing t to the left and all other terms to the right.
-21t=-1.5+4.5
We simplify left and right side of the equation.
-21t=+3
We divide both sides of the equation by -21 to get t.
t=-0.142857142857
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