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Simplifying
4(7 + -7x2) = 7
(7 * 4 + -7x2 * 4) = 7
(28 + -28x2) = 7
Solving
28 + -28x2 = 7
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 + -28x2 = 7 + -28
Combine like terms: 28 + -28 = 0
0 + -28x2 = 7 + -28
-28x2 = 7 + -28
Combine like terms: 7 + -28 = -21
-28x2 = -21
Divide each side by '-28'.
x2 = 0.75
Simplifying
x2 = 0.75
Take the square root of each side:
x = {-0.866025404, 0.866025404}
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