eval_algebra("2 + x = 19") ➞ 17

eval_algebra("4 - x = 1") ➞ 3

eval_algebra("23 + 1 = x") ➞ 24

self.assertEqual(eval_algebra("2 + x = 19"), 17)
self.assertEqual(eval_algebra("4 - x = 1"), 3)
self.assertEqual(eval_algebra("23 + 1 = x"), 24)
self.assertEqual(eval_algebra("25 - 1 = x"), 24)
self.assertEqual(eval_algebra("x + 10 = 53"), 43)
self.assertEqual(eval_algebra("-23 + x = -20"), 3)
self.assertEqual(eval_algebra("10 + x = 5"), -5)
self.assertEqual(eval_algebra("-49 - x = -180"), 131)
self.assertEqual(eval_algebra("x - 46 = -2"), 44)
self.assertEqual(eval_algebra("70 - x = -38"), 108)
self.assertEqual(eval_algebra("-4 - 10 = x"), -14)

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