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9t+(-12t)-2=13
We simplify the equation to the form, which is simple to understand
9t+(-12t)-2=13
Remove unnecessary parentheses
+9t-12t-2=+13
We move all terms containing t to the left and all other terms to the right.
+9t-12t=+13+2
We simplify left and right side of the equation.
-3t=+15
We divide both sides of the equation by -3 to get t.
t=-5
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