5b + 5b = 2 x 5b
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10a + 5b
Area: 15ab Perimeter: 2(3a+5b) or as 6a+10b
6(b + 2)(5b - 2)
The first and third are quadratic expressions in x, the second is a quadratic expressions in n, and the fourth is a quadratic expressions in y. None of them are equations so cannot be solved.
2(3m-5)