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Simplifying
-3 + -5x2 = -28
Solving
-3 + -5x2 = -28
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '3' to each side of the equation.
-3 + 3 + -5x2 = -28 + 3
Combine like terms: -3 + 3 = 0
0 + -5x2 = -28 + 3
-5x2 = -28 + 3
Combine like terms: -28 + 3 = -25
-5x2 = -25
Divide each side by '-5'.
x2 = 5
Simplifying
x2 = 5
Take the square root of each side:
x = {-2.236067978, 2.236067978}
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