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40-5x=4\left(3\times 2+1\right)
Multiply both sides of the equation by 8, the least common multiple of 8,2.
40-5x=4\left(6+1\right)
Multiply 3 and 2 to get 6.
40-5x=4\times 7
Add 6 and 1 to get 7.
40-5x=28
Multiply 4 and 7 to get 28.
-5x=28-40
Subtract 40 from both sides.
-5x=-12
Subtract 40 from 28 to get -12.
x=\frac{-12}{-5}
Divide both sides by -5.
x=\frac{12}{5}
Fraction \frac{-12}{-5} can be simplified to \frac{12}{5} by removing the negative sign from both the numerator and the denominator.