5-r/10=4.2 - solution

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Solution for 5-r/10=4.2 equation:

r in (-oo:+oo)

5-(r/10) = 4.2 // - 4.2

5-(r/10)-4.2 = 0

0.8-1/10*r = 0 // - 0.8

-1/10*r = -0.8 // : -1/10

r = -0.8/(-1/10)

r = 8

r = 8

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