1.3(8-d)+3.7d=-5.2

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Solution for 1.3(8-d)+3.7d=-5.2 equation: 


Simplifying
1.3(8 + -1d) + 3.7d = -5.2
(8 * 1.3 + -1d * 1.3) + 3.7d = -5.2
(10.4 + -1.3d) + 3.7d = -5.2

Combine like terms: -1.3d + 3.7d = 2.4d
10.4 + 2.4d = -5.2

Solving
10.4 + 2.4d = -5.2

Solving for variable 'd'.

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

Add '-10.4' to each side of the equation.
10.4 + -10.4 + 2.4d = -5.2 + -10.4

Combine like terms: 10.4 + -10.4 = 0.0
0.0 + 2.4d = -5.2 + -10.4
2.4d = -5.2 + -10.4

Combine like terms: -5.2 + -10.4 = -15.6
2.4d = -15.6

Divide each side by '2.4'.
d = -6.5

Simplifying
d = -6.5

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