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a.
x + 1 = 2x + 3
x - 2x = 3 - 1
-x = 2
x = -2
b.
4x² + x - 3 = 6 - x²
4x² + x² + x - 3 - 6 = 0
5x² + x - 9 = 0
(jawaban di foto ya)