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Simplifying
5 + 7x(3x) + 5 = 20
Remove parenthesis around (3x)
5 + 7x * 3x + 5 = 20
Reorder the terms for easier multiplication:
5 + 7 * 3x * x + 5 = 20
Multiply 7 * 3
5 + 21x * x + 5 = 20
Multiply x * x
5 + 21x2 + 5 = 20
Reorder the terms:
5 + 5 + 21x2 = 20
Combine like terms: 5 + 5 = 10
10 + 21x2 = 20
Solving
10 + 21x2 = 20
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-10' to each side of the equation.
10 + -10 + 21x2 = 20 + -10
Combine like terms: 10 + -10 = 0
0 + 21x2 = 20 + -10
21x2 = 20 + -10
Combine like terms: 20 + -10 = 10
21x2 = 10
Divide each side by '21'.
x2 = 0.4761904762
Simplifying
x2 = 0.4761904762
Take the square root of each side:
x = {-0.690065559, 0.690065559}
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