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20x-8=2\left(9x+3\right)
Use the distributive property to multiply 4 by 5x-2.
20x-8=18x+6
Use the distributive property to multiply 2 by 9x+3.
20x-8-18x=6
Subtract 18x from both sides.
2x-8=6
Combine 20x and -18x to get 2x.
2x=6+8
Add 8 to both sides.
2x=14
Add 6 and 8 to get 14.
x=\frac{14}{2}
Divide both sides by 2.
x=7
Divide 14 by 2 to get 7.