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-15=2t-4
We simplify the equation to the form, which is simple to understand
-15=2t-4
We move all terms containing t to the left and all other terms to the right.
-2t=-4+15
We simplify left and right side of the equation.
-2t=+11
We divide both sides of the equation by -02 to get t.
t=-5.5
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