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I'm supposed to solve this question using the Substitution Method.
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let 5-z=x
therefore,
8x^2-15x+3=0
x=-b+-sqrt(b^2-4ac)/2a
x=15+sqrt(129)/16 or x=15-sqrt(129)/16
x=0.2276 or x=1.6473
z=5-0.2276 or z=5-1.6473
z=4.7724 or z=3.3527
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