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345999=0\times 28+x\times 64+\left(1-x-0\times 79\right)\times 32
Multiply 0 and 79 to get 0.
345999=0+x\times 64+\left(1-x-0\times 79\right)\times 32
Multiply 0 and 28 to get 0.
345999=0+x\times 64+\left(1-x-0\right)\times 32
Multiply 0 and 79 to get 0.
345999=x\times 64+\left(1-x-0\right)\times 32
Anything plus zero gives itself.
x\times 64+\left(1-x-0\right)\times 32=345999
Swap sides so that all variable terms are on the left hand side.
32\left(-x+1\right)+64x=345999
Reorder the terms.
-32x+32+64x=345999
Use the distributive property to multiply 32 by -x+1.
32x+32=345999
Combine -32x and 64x to get 32x.
32x=345999-32
Subtract 32 from both sides.
32x=345967
Subtract 32 from 345999 to get 345967.
x=\frac{345967}{32}
Divide both sides by 32.