-7-4(1+9d)=20

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Solution for -7-4(1+9d)=20 equation: 


Simplifying
-7 + -4(1 + 9d) = 20
-7 + (1 * -4 + 9d * -4) = 20
-7 + (-4 + -36d) = 20

Combine like terms: -7 + -4 = -11
-11 + -36d = 20

Solving
-11 + -36d = 20

Solving for variable 'd'.

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

Add '11' to each side of the equation.
-11 + 11 + -36d = 20 + 11

Combine like terms: -11 + 11 = 0
0 + -36d = 20 + 11
-36d = 20 + 11

Combine like terms: 20 + 11 = 31
-36d = 31

Divide each side by '-36'.
d = -0.8611111111

Simplifying
d = -0.8611111111

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