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2014-10-06T18:23:52+02:00
A. 4 + 5x = 4 + 5x
b. 4 * 5x = 20x
c. 4x * 5 = 20x
d. 4x + 5x = 9x
e. 4x * 5x = 20x²
f. 4 - 5x = 4 - 5x
g. 4x - 5x = - 1x