The equation -3x(2+5) = -9 simplifies to -3x*7 = -9. By dividing both sides by -21, we get x = 9/21, which reduces to the solution x = 3/7.
To solve the equation -3x(2+5) = -9 for x, we start by simplifying the equation.
First, we perform the operation inside the parentheses:
2 + 5 = 7.
Then, we substitute this back into the equation:
-3x * 7 = -9.
Now, we divide both sides of the equation by -3*7 to solve for x:
x = -9 / (-3*7).
Next, we simplify the right side:
x = -9 / -21.
Recalling multiplication and division rules for signs, we know that a negative divided by a negative gives a positive result:
x = 9 / 21.
We can reduce this fraction by dividing both numerator and denominator by 3:
x = 3 / 7.
Thus, the solution to the equation is:
x = 3 / 7.
The probable question may be:
Solve the equation -3x（2+5） = -9 to find the value of x