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1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17*18*19*20*21=z
We move all terms to the left:
1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17*18*19*20*21-(z)=0
We add all the numbers together, and all the variables
-1z+19+5.1090942171709E=0
We add all the numbers together, and all the variables
-1z+32.887957970421=0
We move all terms containing z to the left, all other terms to the right
-z=-32.887957970421
z=-32.887957970421/-1
z=32+0.887957970421/1
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