0.9y-.7y=4.2

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Solution for 0.9y-.7y=4.2 equation: 


Simplifying
0.9y + -0.7y = 4.2

Combine like terms: 0.9y + -0.7y = 0.2y
0.2y = 4.2

Solving
0.2y = 4.2

Solving for variable 'y'.

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

Divide each side by '0.2'.
y = 21

Simplifying
y = 21

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