4.2*2.5+2.5y=-9.1

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


Simplifying
4.2 * 2.5 + 2.5y = -9.1

Multiply 4.2 * 2.5
10.5 + 2.5y = -9.1

Solving
10.5 + 2.5y = -9.1

Solving for variable 'y'.

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

Add '-10.5' to each side of the equation.
10.5 + -10.5 + 2.5y = -9.1 + -10.5

Combine like terms: 10.5 + -10.5 = 0.0
0.0 + 2.5y = -9.1 + -10.5
2.5y = -9.1 + -10.5

Combine like terms: -9.1 + -10.5 = -19.6
2.5y = -19.6

Divide each side by '2.5'.
y = -7.84

Simplifying
y = -7.84

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