c + c + 2c + c + c = 6c
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2c + 4 - 3c = -9 + c + 5 -c + 4 = c - 4 -2c = -8 2c = 8 c = 4
6c.
The expression is 5d+2c and the unknown variables are d and c
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Why are Quadratic equations, which are expressed in the form of ax2 + bx + c = 0, where a does not equal 0,