Answer:
90+x=30-3[x]
Step-by-step explanation:
collect like terms
x+3x=30-90
4x=-260
divide both sides by 4
x=-60/4
x=-4*3*5/4
x=-[3*5/1]
x=-[3*5]
x=-15
Answer:
The number is 60.
Step-by-step explanation:
Let x = unknown number.
Now we translate the sentence into an equation, one piece at a time.
When 90 is added to a number it equals 30 less than 3 times the number.
x + 90
When 90 is added to a number it equals 30 less than 3 times the number.
x + 90 = 3x - 30
We now solve the equation for x.
Subtract 3x from both sides.
-2x + 90 = -30
Subtract 90 from both sides.
-2x = -120
Divide both sides by -2.
x = 60
The number is 60.
Check:
When 90 is added to a number it equals 30 less than 3 times the number.
Add 90 to 60:
90 + 60 = 150
We get 150.
When 90 is added to a number it equals 30 less than 3 times the number.
Now multiply 60 by 3 and subtract 30.
3(60) - 30 = 180 - 30 = 150
We also get 150.
That means our answer of 60 is correct.
Answer: 60
