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t - 3.2 + 5.1 = 12

This is a linear equation with one unknown (the number represented by "t")

To solve such an equation perform mathematical operations (addition, subtraction, multiplication and division) so that a single quantity of "t" is on the left hand side of the equation and all other terms on the opposite side.

Add 3.2 to both sides :

t - 3.2 + 3.2 + 5.1 = 12 + 3.2 : t + 5.1 = 15.2

Subtract 5.1 from both sides :

t + 5.1 - 5.1 = 15.2 - 5.1 : t = 10.1

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Q: How do you solve this equation t - 3.2 plus 5.1 equals 12?
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