3 years ago

Find a number that is 15 more than 4 times its opposite

1 answer:

5 0

$x-\ number\\\\
x-15=4(-x)\\\\
x-15=-4x\ \ \ \ |subtract\ x\\\\
-15=-5x\ \ \ \ |divide\ by\ -5\\\\
x=3\\\\Number\ is\ equal\ to\ 3.$

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In this problem, we have two similar triangles:

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