What is c equal to in the equation 7c - 4 = 3c + 20

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Which operation should be performed first according to the order of operations? 44 • 2 – [(5 + 20 • 3) – 12] + 16 ÷ 2 5 + 20 20 • 3 16 ÷ 2 44 • 2

What is the maximum total area that 450cm of string can enclose if it is used to form perimeters of two adjoining rectangles as shown?