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2x² - 7ax = - 3a²
x² - 7/2 ax = -3/2 a²
x² - 7/2 ax + 49/16 a² = -3/2 a² + 49/16 a²
(x - 7/4 a)² = 25/16 a²
x - (7/4)a = ± (5/4)a
x - (7/4)a = (5/4)a
x = 3a
atau
x - (7/4)a = - (5/4)a
x = (1/2)a