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402 = 2(4x -3)
402 = 8x - 6
402+6 = 8x
408 = 8x
408/8 = x
51 = x
jadi nilai x adalah 51
b). panjang = 2x+1
= 2.51 + 1
= 103 cm
lebar = 2x -4
= 2.51 -4
= 98 cm
c). luas = 103 x 98 = 10.094 cm²