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4/10 = 9/21
2/5 = 3/7
L <> R
| -5(2x+5)=35 | | 18/21=25/x | | 3xy=19 | | -7(1x-1)=-21 | | -4.9x^2+49x+1.5=1.5 | | 14*6x=7x*12 | | 26/30=x/40 | | cos^-1(4/8) | | -3x+6x=3 | | 10/12=x/100 | | 6(-7x+8)=-456 | | 2x-9=4x-11 | | 33-4x=20+9x | | 16/16-4/8= | | 6x+3=-4x-47 | | 7x+9=2x+2 | | 10+3x=-x-23 | | y/7-5=12 | | 4x+3=11+3x | | 7x+4x-32=48-5x | | 3x-2(x/5)=20 | | x^2+8x+y^2-12y=12 | | 7-4p=4p+5 | | (8x+3)=(9x+4) | | 4x+6=7x+0 | | 7x+6x-22=44-9x | | (6x-7)=49 | | v+4=-2+2v | | -6x+8=3x-64 | | R^2=18-9r | | -7(x+8)+3=-109 | | 5a=54+2a |