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5x-40+4x=2\left(x-2\right)+3x
Use the distributive property to multiply -4 by 10-x.
9x-40=2\left(x-2\right)+3x
Combine 5x and 4x to get 9x.
9x-40=2x-4+3x
Use the distributive property to multiply 2 by x-2.
9x-40=5x-4
Combine 2x and 3x to get 5x.
9x-40-5x=-4
Subtract 5x from both sides.
4x-40=-4
Combine 9x and -5x to get 4x.
4x=-4+40
Add 40 to both sides.
4x=36
Add -4 and 40 to get 36.
x=\frac{36}{4}
Divide both sides by 4.
x=9
Divide 36 by 4 to get 9.