Answer:
BC = 13
Explanation:
AB + BC = AC, substitute values
4x + 2x - 3 = 45, that is
6x - 3 = 45 ( add 3 to both sides )
6x = 48 ( divide both sides by 6 )
x = 8
Hence
BC = 2x - 3 = (2 × 8) - 3 = 16 - 3 = 13
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