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Exercise

$-1=3+\frac{x}{21}$

Step-by-step Solution

1

Combine all terms into a single fraction with $21$ as common denominator

$-1=\frac{21\cdot 3+x}{21}$
2

Multiply $21$ times $3$

$-1=\frac{63+x}{21}$
3

Multiply both sides of the equation by $21$

$63+x=-21$
4

We need to isolate the dependent variable $x$, we can do that by simultaneously subtracting $63$ from both sides of the equation

$x+63-63=-21-63$
5

Canceling terms on both sides

$x=-84$

Final answer to the exercise

$x=-84$

Try other ways to solve this exercise

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  • Solve for x
  • Find the derivative using the definition
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Main Topic: One-variable linear equations

Algebraic equations that have just one variable.

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