4. Solve 5x + 20 S 9x - 8, XE W.
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Answer :
Simplifying
5x + 20 = 9x + -8
Reorder the terms:
20 + 5x = 9x + -8
Reorder the terms:
20 + 5x = -8 + 9x
Solving
20 + 5x = -8 + 9x
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-9x' to each side of the equation.
20 + 5x + -9x = -8 + 9x + -9x
Combine like terms: 5x + -9x = -4x
20 + -4x = -8 + 9x + -9x
Combine like terms: 9x + -9x = 0
20 + -4x = -8 + 0
20 + -4x = -8
Add '-20' to each side of the equation.
20 + -20 + -4x = -8 + -20
Combine like terms: 20 + -20 = 0
0 + -4x = -8 + -20
-4x = -8 + -20
Combine like terms: -8 + -20 = -28
-4x = -28
Divide each side by '-4'.
x = 7
Simplifying
x = 7
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