15x - 3xy = 3x(5 - y) 20 - 4y = 4(5 - y) 15x - 3xy + 20 - 4y = (3x + 4)(5 - y)
Use algebra. 12x+30=15x-20. Add 20 to both sides. 12x+50=15x. Subtract 12x from both sides. 50=3x. Divide both sides by 3. 16.666...=x
35
55
It is: -5x-20 when simplified
(x+20)(x-5) x=5 or -20
distributive
x - 5 = 15x = 20
15x-17
-15x=-5*3x+2 -15x=-15x+2 +15x +15x ----------------- 0=2
The distributive property states that a(b + c) = ab + ac. This only works in your case if you meant to write 15(x + 20). That would equal 15x + 300.
You're looking for factors of 100 that differ by 20. (x + 5)(x - 20)