The simplification of each form of expression is;
- (6r + 7) + (13 + 7r) = 13r + 20
- (13 - 3/2r) - (1 - r) = 12 - 1/2r
- (-8 - r) + (2r - 4) = -12 + r
- (7r - 3/2) - (2/3 + 6r) = r - 13/6
Simplification
(6r + 7) + (13 + 7r)
= 6r + 7 + 13 + 7r
= 13r + 20
(13 - 3/2r) - (1 - r)
= 13 - 3/2r - 1 + r
= 12 - 3/2r + r
= 12 -3r+2r/ 2
= 12 - 1/2r
(-8 - r) + (2r - 4)
= -8 - r + 2r - 4
= -12 + r
(7r - 3/2) - (2/3 + 6r)
= 7r - 3/2 - 2/3 - 6r
= r -9-4/6
= r - 13/6
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