4=2.50x+21

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Solution for 4=2.50x+21 equation:


Simplifying
4 = 2.50x + 21

Reorder the terms:
4 = 21 + 2.50x

Solving
4 = 21 + 2.50x

Solving for variable 'x'.

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

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

Combine like terms: 2.50x + -2.50x = 0.00
4 + -2.50x = 21 + 0.00
4 + -2.50x = 21

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

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

Combine like terms: 21 + -4 = 17
-2.50x = 17

Divide each side by '-2.50'.
x = -6.8

Simplifying
x = -6.8

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