1. 7x - 28 = 84
2. 7x = 112
3. x = 16
Answer:
The student made an error during the distributive property in the second step where they multiplied 0.15 by -0.2 to equal -0.3 when it should have been -0.03.
Step-by-step explanation:

Answer:
one solution
x = 12
Step-by-step explanation:
3 (x-1) = 2x + 9
3x - 3 = 2x + 9
subtract 2x from each side of the equation:
x - 3 = 9
add 3 to each side:
x = 12
Answer:
8x+7
Step-by-step explanation:
In total there are 20 students and only 6 read 1 book. So the answer would be 6/20