C=2b
d=c+7
b+c=57⇒b+2b=57⇒3b=57⇒ b=19, c=2*19=38, d=38+7=45
thats given
lets find if there is an x such that d-x=b+x=c⇔ 43-x=19+x=38
43-x=38⇒x=43-38=5
19+x=38⇒x=19
there is no single x (cant be both 5 and 19)
so, i think dan was incorrect.
Answer:
425
Step-by-step explanation:
(replace the variables) 6(9)-2(5)^2
(simplified) 54-10^2.... 54-100=-46
Step-by-step explanation:
4x - 3 = 4x + 5
4x - 4x = 5 + 3
0 = 8
x is disappear and 2 both sides are not equal
