x + 6 = 12

solve("x + 43 = 50") ➞ 7

solve("x - 9 = 10") ➞ 19

solve("x + 300 = 100") ➞ -200

self.assertEqual(solve("x + 43 = 50"), 7)
self.assertEqual(solve("x - 9 = 10"), 19)
self.assertEqual(solve("x + 300 = 100"), -200)
self.assertEqual(solve("x - 0 = 0"), 0)
self.assertEqual(solve("x + 188 = 866"), 678)
self.assertEqual(solve("x + -500 = -200"), 300)

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