Question

20 points for answer

Answer 1

x = 11

Explanation:

Convert decimals to integers:
`(3x-21)/(30) =0.4`

Multiply both sides of the equation by the common denominator:
`((3x-21)*30)/(30) =0.4*30`

Reduce the fraction:
`3x-21=0.4*30`

Calculate the product or quotient: 3x - 21 = 12

Rearrange unknown terms to the left side of the equation: 3x = 12 + 21

Calculate the sum or difference: 3x = 33

Divide both sides of the equation by the coefficient of variable: x = 33 ÷ 3

Calculate the product or quotient: x = 11

Answer:

x = 11