The pairs matching the simplified expressions to the original expressions are given as follows:
- 13r + 20 -> (6r + 7) + (13 + 7r).
- 12 - 1/2r -> (13 - 1.5r) - (1 - r).
- -12 + r -> (-8 - r) + (2r - 4).
- r - 13/6 -> (7r - 1.5) - (0.6667 + 6r).
How an expression is simplified?
An expression is simplified combining like terms, that is, adding or subtracting the terms that have the same variable.
Hence, the simplified expressions are given as follows:
- (6r + 7) + (13 + 7r) = 13r + 20
- (13 - 1.5r) - (1 - r) = 13 - 1.5r - 1 + r = 12 - 1/2r.
- (-8 - r) + (2r - 4) = -12 + r.
- (7r - 1.5) - (0.6667 + 6r) = r - 13/6.
A similar problem, in which an expression is simplified combining like terms, is given at brainly.com/question/27749451
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