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perkalian silang, didapat :
5.(x+6) = 4.(x+10)
5x+30 = 4x+40
5x-4x = 40-30
x = 10
20(x + 6/4) = 20(x + 10/5)
5(x + 6) = 4(x + 10)
5x + 30 = 4x + 40
5x - 4x = 40 - 30
x = 10
Jadi nilai x adalah 10.