0.21=0.3*y

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Solution for 0.21=0.3*y equation: 


Simplifying
0.21 = 0.3y

Solving
0.21 = 0.3y

Solving for variable 'y'.

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

Add '-0.3y' to each side of the equation.
0.21 + -0.3y = 0.3y + -0.3y

Combine like terms: 0.3y + -0.3y = 0.0
0.21 + -0.3y = 0.0

Add '-0.21' to each side of the equation.
0.21 + -0.21 + -0.3y = 0.0 + -0.21

Combine like terms: 0.21 + -0.21 = 0.00
0.00 + -0.3y = 0.0 + -0.21
-0.3y = 0.0 + -0.21

Combine like terms: 0.0 + -0.21 = -0.21
-0.3y = -0.21

Divide each side by '-0.3'.
y = 0.7

Simplifying
y = 0.7

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