4+21x=2.50

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Solution for 4+21x=2.50 equation: 


Simplifying
4 + 21x = 2.50

Solving
4 + 21x = 2.50

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4' to each side of the equation.
4 + -4 + 21x = 2.50 + -4

Combine like terms: 4 + -4 = 0
0 + 21x = 2.50 + -4
21x = 2.50 + -4

Combine like terms: 2.50 + -4 = -1.5
21x = -1.5

Divide each side by '21'.
x = -0.07142857143

Simplifying
x = -0.07142857143

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