3(4.2+d)=8.1

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Solution for 3(4.2+d)=8.1 equation: 


Simplifying
3(4.2 + d) = 8.1
(4.2 * 3 + d * 3) = 8.1
(12.6 + 3d) = 8.1

Solving
12.6 + 3d = 8.1

Solving for variable 'd'.

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

Add '-12.6' to each side of the equation.
12.6 + -12.6 + 3d = 8.1 + -12.6

Combine like terms: 12.6 + -12.6 = 0.0
0.0 + 3d = 8.1 + -12.6
3d = 8.1 + -12.6

Combine like terms: 8.1 + -12.6 = -4.5
3d = -4.5

Divide each side by '3'.
d = -1.5

Simplifying
d = -1.5

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