Question

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

Answer 1

x+70=82
x=12

580-x=400
x=180

Answer 2

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