Tìm x, biết:
a) 213+312:x+317+712=16986
b) 7+0,004.x:0,9:24,7−12,3=77,7
c) 637−0,75x−20,35.2,8+1,75:0,05=235
d) 547:x:1,3+8,4.67.6−2,3+5:6,25.78.0,0125+6,9=1114
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