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4×x-1=48
x=48:4-1
x=11
maaf klo salah
48 = 8. (x+1) /2
48 = 8x + 8 /2
48.2 = 8x + 8
96 = 8x + 8
96-8 = 8x
88 = 8x
88/8 = x
11 = x
jadi nilai x adalah 11