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2x = 3+4
2x = 7
x = 7/2
x = 3.5
2x-4 = 3 ⇒2x = 7 ⇒x = 7/2 dan
2x-4 = -3 ⇒2x = 1 ⇒x = 1/2
jadi x = 7/2 atau 1/2