10*(9+d)=210

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Solution for 10*(9+d)=210 equation: 


Simplifying
10(9 + d) = 210
(9 * 10 + d * 10) = 210
(90 + 10d) = 210

Solving
90 + 10d = 210

Solving for variable 'd'.

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

Add '-90' to each side of the equation.
90 + -90 + 10d = 210 + -90

Combine like terms: 90 + -90 = 0
0 + 10d = 210 + -90
10d = 210 + -90

Combine like terms: 210 + -90 = 120
10d = 120

Divide each side by '10'.
d = 12

Simplifying
d = 12

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