The value of x in the equation is - 3.
<h3>How to find the variable in an equation?</h3>
Variables are number represented by a letter in an equation.
Therefore,
-5x - 9 = 2x + 12
subtract 12 from both sides of the equation
-5x - 9 = 2x + 12
-5x - 9 - 12 = 2x + 12 - 12
-5x - 21 = 2x
add 21 to both sides of the equation
-5x - 21 = 2x
-5x - 21 + 21 = 2x + 21
-5x = 2x + 21
subtract 2x from both sides
-5x = 2x + 21
-5x - 2x = 2x -2x + 21
-7x = 21
divide both sides by -7
-7x / -7 = 21 / - 7
x = -3
learn more on equation here: brainly.com/question/7421811
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Divide and multiply the numbers :)
Answer:
9
Step-by-step explanation:
4+4=8, 26-8=18, 18 <em>/ </em>2 = 9, and this is 100% right becuase I got it right on Khan Academy
If every one of the 8 people shakes hand with one anouther, they need you to calculate how many handshakes are happening.
