Question

Solve the equation: 5(r + 4) = -12 + 7r*

No solution

r = -30

r = 16

r = 8

Answer 1

`r=16`

Explanation:

`5(r + 4) = -12 + 7r`

➠ Use the distributive property to multiply 5 by r +4:

`5r+20=-12+7r`

➠ Subtract 7r from both sides:

`5r+20-7r=-12`

➠ Combin 5r and -7r to get -2r:

`-2r+20=-12`

➠ Subtract 20 from both sides:

`-2r=-32`

➠ Divide both sides by -2:

`r=(-32)/(-2)`

`r=16`

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