Answer:
x = 
Step-by-step explanation:
Step 1: Simplify both sides of the equation.
128=12(8+x)
128=(12)(8)+(12)(x)(Distribute)
128=96+12x
128=12x+96
Step 2: Flip the equation.
12x+96=128
Step 3: Subtract 96 from both sides.
12x+96−96=128−96
12x=32
Step 4: Divide both sides by 12.

x=8/3
Answer:
2/7
Step-by-step explanation:
12 : 42 is the same as 12/42
simplify the fraction by dividing the numerator and denominator by 6
you get 2/7