-3(2.5+1)(2.5-6)=y

Solution for -3(2.5+1)(2.5-6)=y equation:

Simplifying
-3(2.5 + 1)(2.5 + -6) = y

Combine like terms: 2.5 + 1 = 3.5
-3(3.5)(2.5 + -6) = y

Combine like terms: 2.5 + -6 = -3.5
-3 * 3.5(-3.5) = y

Multiply -3 * 3.5
-10.5 * -3.5 = y

Multiply -10.5 * -3.5
36.75 = y

Solving
36.75 = y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-1y' to each side of the equation.
36.75 + -1y = y + -1y

Combine like terms: y + -1y = 0
36.75 + -1y = 0

Add '-36.75' to each side of the equation.
36.75 + -36.75 + -1y = 0 + -36.75

Combine like terms: 36.75 + -36.75 = 0.00
0.00 + -1y = 0 + -36.75
-1y = 0 + -36.75

Combine like terms: 0 + -36.75 = -36.75
-1y = -36.75

Divide each side by '-1'.
y = 36.75

Simplifying
y = 36.75