Mindy and Troy ate 9 pieces of cake. Mindy ate 3 pieces of cake Troy had 1/4 of the total cake. What is the equation and answer

20

step-by-step explanation:

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

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2(2x + 3) = -4 + 2(2x + 5)

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 6

4x - 6 + 6 = 4x - 6 + 6

4x = 4x

x = x

unlimited solutions.