2/3(x+12)+2/3x=4 how do you solve the equation?

Simplify each term.
2x/3+8+2x/3=4

Add 2x/3 and 2x/3 to get 2(2x/3).
2(2x/3)+8=4

Simplify.
4x/3+8=4

Since 8 does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting 8 from both sides.
4x/3=−8+4

Add −8 and 4 to get −4.
4x/3=−4

Multiply both sides of the equation by 3.
4x=−4⋅(3)

Multiply −4 by 3 to get −12.
4x=−12

Divide each term in the equation by 4.
x=−3

x is equal to -3

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The answer is, the streetlight is 18 inches tall.