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7x_{3}-45
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7x_{3}-45
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3+7x_{3}-24-\left(45-21\right)
Divide 150 by 50 to get 3.
-21+7x_{3}-\left(45-21\right)
Subtract 24 from 3 to get -21.
-21+7x_{3}-24
Subtract 21 from 45 to get 24.
-45+7x_{3}
Subtract 24 from -21 to get -45.
3+7x_{3}-24-\left(45-21\right)
Divide 150 by 50 to get 3.
-21+7x_{3}-\left(45-21\right)
Subtract 24 from 3 to get -21.
-21+7x_{3}-24
Subtract 21 from 45 to get 24.
-45+7x_{3}
Subtract 24 from -21 to get -45.
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