-2.5+d=4.2

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Solution for -2.5+d=4.2 equation: 


Simplifying
-2.5 + d = 4.2

Solving
-2.5 + d = 4.2

Solving for variable 'd'.

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

Add '2.5' to each side of the equation.
-2.5 + 2.5 + d = 4.2 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + d = 4.2 + 2.5
d = 4.2 + 2.5

Combine like terms: 4.2 + 2.5 = 6.7
d = 6.7

Simplifying
d = 6.7

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