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Simplifying
5x2 + -28 = 0
Reorder the terms:
-28 + 5x2 = 0
Solving
-28 + 5x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '28' to each side of the equation.
-28 + 28 + 5x2 = 0 + 28
Combine like terms: -28 + 28 = 0
0 + 5x2 = 0 + 28
5x2 = 0 + 28
Combine like terms: 0 + 28 = 28
5x2 = 28
Divide each side by '5'.
x2 = 5.6
Simplifying
x2 = 5.6
Take the square root of each side:
x = {-2.366431913, 2.366431913}
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