x is an unknown number/fraction which needs to be solved.
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The answer to the equation y x - x a would be x(y-1). When letters are used in a math expression, this is a form of math called Pre-Algebra or Algebra.
2 x 41 = 82
6.2 x 1.4 = 8.68
In math speak: Solving the equation means finding 'x' values that make the equation true. These 'x' values are called the roots of the quadratic.
Equivalent equation means two equations, x and y,such thatx = y