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t+9=30-2t
We simplify the equation to the form, which is simple to understand
t+9=30-2t
We move all terms containing t to the left and all other terms to the right.
+1t+2t=+30-9
We simplify left and right side of the equation.
+3t=+21
We divide both sides of the equation by 3 to get t.
t=7
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