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-1/4-(2/7)
-(2/7)-1/4
-2/7-1/4
-(1/4+2/7)
-15/28
| 6x+4x=2x+60 | | 2x-5+x+2=49 | | 3y-2=6+y | | 3(7+5x)=186 | | x=9-26 | | -3(4+4x)=36 | | x=26+9 | | x=26-9 | | 100=5(r+15) | | 4x+5y+11z=-55 | | -5(-1x+6)=-30 | | -1n-18=-3n-4 | | 10000=4*85*x*100 | | 8x-38y=130 | | 4x+19y=260 | | 10.000=4*85*x*100 | | 6(5x-9)=306 | | 15/5=x/4 | | v/4-9=12 | | 2(5-6x)=70 | | 7(-5+4x)=21 | | u^2-7u=-10 | | 7(-2x+5)=189 | | 16x-30y=100 | | -4(-1-6x)=268 | | 3/2u=54 | | 4(1+2x)=28 | | 1.5*4= | | 54=3/2u | | -2-x=6x-44 | | -3x+10=5x+58 | | -88=2(-2+7x) |