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3t--2.1=8.1
We simplify the equation to the form, which is simple to understand
3t+2.1=8.1
We move all terms containing t to the left and all other terms to the right.
+3t=+8.1-2.1
We simplify left and right side of the equation.
+3t=+6
We divide both sides of the equation by 3 to get t.
t=2
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