0.3(d+1.2)+d=-0.6(d+0.3)

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Solution for 0.3(d+1.2)+d=-0.6(d+0.3) equation: 


Simplifying
0.3(d + 1.2) + d = -0.6(d + 0.3)

Reorder the terms:
0.3(1.2 + d) + d = -0.6(d + 0.3)
(1.2 * 0.3 + d * 0.3) + d = -0.6(d + 0.3)
(0.36 + 0.3d) + d = -0.6(d + 0.3)

Combine like terms: 0.3d + d = 1.3d
0.36 + 1.3d = -0.6(d + 0.3)

Reorder the terms:
0.36 + 1.3d = -0.6(0.3 + d)
0.36 + 1.3d = (0.3 * -0.6 + d * -0.6)
0.36 + 1.3d = (-0.18 + -0.6d)

Solving
0.36 + 1.3d = -0.18 + -0.6d

Solving for variable 'd'.

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

Add '0.6d' to each side of the equation.
0.36 + 1.3d + 0.6d = -0.18 + -0.6d + 0.6d

Combine like terms: 1.3d + 0.6d = 1.9d
0.36 + 1.9d = -0.18 + -0.6d + 0.6d

Combine like terms: -0.6d + 0.6d = 0.0
0.36 + 1.9d = -0.18 + 0.0
0.36 + 1.9d = -0.18

Add '-0.36' to each side of the equation.
0.36 + -0.36 + 1.9d = -0.18 + -0.36

Combine like terms: 0.36 + -0.36 = 0.00
0.00 + 1.9d = -0.18 + -0.36
1.9d = -0.18 + -0.36

Combine like terms: -0.18 + -0.36 = -0.54
1.9d = -0.54

Divide each side by '1.9'.
d = -0.2842105263

Simplifying
d = -0.2842105263

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