Question

[(20+339:3+a:4)x7-5x400]:3-22x3+125x8=1000

Answer 1

[(20 + 339 : 3 + a: 4)* 7 - 5*400] :3-22*3+125*8 = 1000
[(20 + 113 + (a/4) )* 7 - 2000]* (1/3) + 66 + 1000 = 1000
(931 + (7a/4) - 2000)* (1/3) + 66 +1000= 1000
(-1069 + (7a /4)) * (1/3) + 66 + 1000 = 1000
$\frac{-4276+7a}{4}* \frac{1}{3} + 66+1000=1000$
$\frac{-4276+7a}{12} +66 = 0$
-4276 + 7a + 792 = 0
-3484 + 7a= 0
7a = 3484
$a= \frac{3484}{7}$