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180 = 1/2(4x + 6) . 2x
180 = (4x + 6) x
180 = 4x² + 6x
4x² +6x - 180 = 0 dibagi 2
2x² + 3x - 90 = 0
(2x+15)(x-6) = 0
x= -15/2 atau x =6