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25-08-2017
Mathematics

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Three times a number plus 12 minus 5 times the same number is 22. What is the number?

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leschausettes leschausettes

25-08-2017

3x + 12 - 5x = 22
-2x + 12 = 22
-2x = 10
x = -5

Write the equation out, x is going to be your unknown number.
Combine like terms.
We have to isolate x, so get rid of the 12 by subtracting it from both sides of the equation.
Divide by -2.

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