Solve for x
x=\frac{1}{390}\approx 0.002564103
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390x+13x\times 0\times 8\times 20=1
Multiply 13 and 30 to get 390.
390x+0x\times 8\times 20=1
Multiply 13 and 0 to get 0.
390x+0x\times 20=1
Multiply 0 and 8 to get 0.
390x+0x=1
Multiply 0 and 20 to get 0.
390x+0=1
Anything times zero gives zero.
390x=1
Anything plus zero gives itself.
x=\frac{1}{390}
Divide both sides by 390.
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