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-7t+21+4t=21+3t
We simplify the equation to the form, which is simple to understand
-7t+21+4t=21+3t
We move all terms containing t to the left and all other terms to the right.
-7t+4t-3t=+21-21
We simplify left and right side of the equation.
-6t=0
We divide both sides of the equation by -6 to get t.
t=-0
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