How do you solve $12 r - 10 r = 20$ $12r - 10r = 20$ ?

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How do you solve $12 r - 10 r = 20$ $12r - 10r = 20$ ?

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Answer 1 · 2017-07-15T16:20:03

$r = 10$ $r=10$

Explanation:

$collect like terms on the left side of the equation$ $"collect like terms on the left side of the equation"$

$\Rightarrow 2 r = 20$ $rArr2r=20$

$divide both sides by 2$ $"divide both sides by 2"$

$(cancel(2) r)/cancel(2)=20/2$

$rArrr=10$

$color(blue)"As a check"$

$"left side "=(12xx10)-(10xx10)=120-100=20$

$rArrr=10" is the solution"$

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How do you solve $12 r - 10 r = 20$ $12r - 10r = 20$ ?

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