3*10+4*y=12

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Solution for 3*10+4*y=12 equation: 


Simplifying
3 * 10 + 4y = 12

Multiply 3 * 10
30 + 4y = 12

Solving
30 + 4y = 12

Solving for variable 'y'.

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

Add '-30' to each side of the equation.
30 + -30 + 4y = 12 + -30

Combine like terms: 30 + -30 = 0
0 + 4y = 12 + -30
4y = 12 + -30

Combine like terms: 12 + -30 = -18
4y = -18

Divide each side by '4'.
y = -4.5

Simplifying
y = -4.5

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