(6 + 80) * 3 = 21
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3 x 7 = 21
0
11x - 21 = 7x + 3 4x = 24x = 6
y=3, and y=-3. 6y² - 54 = 0 factors to 6(y² - 9) = 0 --> 6(y + 3)(y - 3) = 0
The solution (not sum) to the equation 21 = 3c + 6 is as follows:21 = 3c + 621 - 6 = 3c + 6 - 615 = 3c3c = 153c/3 = 21/3c = 7