x/2 + x + x/3 = 8
Simplify both sides of the equation
x/2 + x +x/3 = 8
Simplify
11/6 x = 8
Multiply both sides by 6/11
(6/11)*(11/6 x ) = (6/11)*(8)
x = 48 / 11
decimal will be x = 4.36
-7(x-1)-3(x-4)
Distribute
(-7)(x)+(-7)(-1)+(-3)(x)+(-3)(-4)
= -7x+7+ -3x +12
Combine like terms
-7x+7+ -3x+12
= (-7x+ -3x ) + ( 7+12)
= -10x + 19
3(x-2)^2 -5(x-2)+3
Distribute
= 3x^2 + -12x+12+(-5)(x)+(-5)(-2)+3
= 3x^2 +-12x+12+ -5x +10 +3
Combine like terms
3x^2 + -12x+12+ - 5x+10 +3
(3x^2) + (-12x+ -5x ) + (12+10+3)
= 3x^2 + -17x + 25
= 3x^2 -17x+25
I hope that's help ! Please if you have question about all 3 just let me know .