3(-6+7x)=87

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Solution for 3(-6+7x)=87 equation: 


Simplifying
3(-6 + 7x) = 87
(-6 * 3 + 7x * 3) = 87
(-18 + 21x) = 87

Solving
-18 + 21x = 87

Solving for variable 'x'.

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

Add '18' to each side of the equation.
-18 + 18 + 21x = 87 + 18

Combine like terms: -18 + 18 = 0
0 + 21x = 87 + 18
21x = 87 + 18

Combine like terms: 87 + 18 = 105
21x = 105

Divide each side by '21'.
x = 5

Simplifying
x = 5

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