3. Find x for the equation: (2 + x)(7 – x)/(5 – x)(4 + x) = 1
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Answer:
x = 1.5
Step-by-step explanation:
(2 + x)(7 – x) ÷ (5 – x)(4 + x) = 1
14-2x+7x-x² ÷ 20+5x-4x-x² = 1
14-2x+7x-x² = 20+5x-4x-x²
-x²+5x+14 = -x²+x+20
0 = -x²+x²+x-5x+20-14
0 = -4x+6
4x = 6
x = 6÷4
x = 3÷2
x = 1.5
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