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⇔ 1 + 1 = 2
⇔ 2 = 2
atau
⇔ 1 + 1 = 2
⇔ 1 = 2-1
⇔ 1 = 1
ini sama saja dengan a + a = 2a
misalkan a = 2
berarti : a + a = 2a
2 + 2 = 2x2
4 = 4