Hey there!
40 - 3 * x = 25
-3x + 40 = 25
ADD 40 to BOTH SIDES
-3x + 40 - 40 = 25 - 40
CANCEL out: 40 - 40 because it gives you 1
KEEP: 25 - 40 because it helps solve for the x-value
NEW EQUATION: -3x = 25 - 40
SIMPLIFY
25 - 40 = -15
NEW EQUATION: -3x = -15
DIVIDE -3 to BOTH SIDES
-3x/-3 = -15/-3
CANCEL out: -3/-3 because it gives you 1
KEEP: -15/-3 because it helps solve for the x-value
NEW EQUATION: x = -15/-3
SIMPLIFY
x = 5
Good luck on your assignment and enjoy your day!
~Amphitrite1040:)
