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7(3t-12)+7=-7(-2t-7)
We simplify the equation to the form, which is simple to understand
7(3t-12)+7=-7(-2t-7)
Reorder the terms in parentheses
+(+21t-84)+7=-7*(-2t-7)
Remove unnecessary parentheses
+21t-84+7=-7+*(-2t-7+)
Reorder the terms in parentheses
+21t-84+7=+(+14t+49)
Remove unnecessary parentheses
+21t-84+7=+14t+49
We move all terms containing t to the left and all other terms to the right.
+21t-14t=+49+84-7
We simplify left and right side of the equation.
+7t=+126
We divide both sides of the equation by 7 to get t.
t=18
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