-11.2+4(2.1q)=-0.8

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Solution for -11.2+4(2.1q)=-0.8 equation: 


Simplifying
-11.2 + 4(2.1q) = -0.8

Remove parenthesis around (2.1q)
-11.2 + 4 * 2.1q = -0.8

Multiply 4 * 2.1
-11.2 + 8.4q = -0.8

Solving
-11.2 + 8.4q = -0.8

Solving for variable 'q'.

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

Add '11.2' to each side of the equation.
-11.2 + 11.2 + 8.4q = -0.8 + 11.2

Combine like terms: -11.2 + 11.2 = 0.0
0.0 + 8.4q = -0.8 + 11.2
8.4q = -0.8 + 11.2

Combine like terms: -0.8 + 11.2 = 10.4
8.4q = 10.4

Divide each side by '8.4'.
q = 1.238095238

Simplifying
q = 1.238095238

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