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411×11+336×12-a=23×128+245×11

4521+4032-a=2944+2695

8553-a=5639

a=8553-5639  

a=2914

411 × 11 + 336 × 12 - a = 23 × 128 + 245 × 11

4521 + 4032 - a = 2944 + 2695

8.553 - a = 5.639

a = 8553 - 5639

a = 2.914