2.1*d+.7=7

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Solution for 2.1*d+.7=7 equation: 


Simplifying
2.1d + 0.7 = 7

Reorder the terms:
0.7 + 2.1d = 7

Solving
0.7 + 2.1d = 7

Solving for variable 'd'.

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

Add '-0.7' to each side of the equation.
0.7 + -0.7 + 2.1d = 7 + -0.7

Combine like terms: 0.7 + -0.7 = 0.0
0.0 + 2.1d = 7 + -0.7
2.1d = 7 + -0.7

Combine like terms: 7 + -0.7 = 6.3
2.1d = 6.3

Divide each side by '2.1'.
d = 3

Simplifying
d = 3

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