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9t-21=3(t-7)+5t
We simplify the equation to the form, which is simple to understand
9t-21=3(t-7)+5t
Reorder the terms in parentheses
9t-21=+(+3t-21)+5t
Remove unnecessary parentheses
+9t-21=+3t-21+5t
We move all terms containing t to the left and all other terms to the right.
+9t-3t-5t=-21+21
We simplify left and right side of the equation.
+1t=0
We divide both sides of the equation by 1 to get t.
t=0
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