10-(12-4+2)=
4x(5-3+2)=
[2x(4+8x2)-10]:6=
15:3+2x(7-1)=
30-3x[8-2x(3+1)]=
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4x(5-3+2)=4*(2+2)=4*4=16
[2x(4+8x2)-10]:6=[2*(4+16)-10]:6=(2*20-10):6=(40-10):6=30:6=5
15:3+2x(7-1)=5+2*6=5+12=17
30-3x[8-2x(3+1)]=30-3(8-2*4)=30-3*(8-8)=30-3*0=30