4.2*2+2.5y=-9.1

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Solution for 4.2*2+2.5y=-9.1 equation: 


Simplifying
4.2 * 2 + 2.5y = -9.1

Multiply 4.2 * 2
8.4 + 2.5y = -9.1

Solving
8.4 + 2.5y = -9.1

Solving for variable 'y'.

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

Add '-8.4' to each side of the equation.
8.4 + -8.4 + 2.5y = -9.1 + -8.4

Combine like terms: 8.4 + -8.4 = 0.0
0.0 + 2.5y = -9.1 + -8.4
2.5y = -9.1 + -8.4

Combine like terms: -9.1 + -8.4 = -17.5
2.5y = -17.5

Divide each side by '2.5'.
y = -7

Simplifying
y = -7

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