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450=1200-3t
We simplify the equation to the form, which is simple to understand
450=1200-3t
We move all terms containing t to the left and all other terms to the right.
+3t=+1200-450
We simplify left and right side of the equation.
+3t=+750
We divide both sides of the equation by 03 to get t.
t=250
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