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412:4+{19+2x[216-5x(axb+1)]}x10=2013
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412:4+ {19 + 2x[216-5x(axb+1)]}x10=2013
103+ { 19 + 2x[216-5x(axb+1)]}x10=2013|-103
{19+2x[216-5x(axb+1)]}x10=1910|:10
19+2x[216-5x(axb+1)]=191|-19
2x[216-5x(axb+1)]=172|:2
216-5x(axb+1)=86    5x(axb+1)=216-86
5x(axb+1)=130:5
axb+1=26-1
axb=25
 a =1,5,25     b=25,5,1.
proba:5x5=25
1x25=25
25x1=25.