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2x - y - 5 = 3x - 3y - 10
2x - 3x - y + 3y =5 - 10
-x + 2y = -5
√(x - y + 12) = √(x + 2y) (kuadratkan)
x - y + 12 = x + 2y
0 + 12 = 3y
y = 4
-x + 2y = -5
-x + 2(4) = -5
-x + 8 = -5
13 = x