Question

(X+70)*4=328. (580-x):4=100

Answer 1

x+70=82
x=12

580-x=400
x=180

Answer 2

$(x + 70) times 4 = 328 \ x + 70 = 328 div 4 \ x + 70 = 82 \ x = 12$
$(580 - x) div 4 = 100 \ 580 - x = 400 \ x = 180$