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4x-3x=5+3
x=8
5x+2=7-3x
5x+3x=7-2
8x=5/8
x= 0.625
0.2x+0.3=-0.5
0.2x=-0.5-0.3
0.2x=-0.8/0.2
x= -0.4
0.4+0.25=-2
0.25x= -2-0.4
0.25x= -2.4/0.25
x= -9.6
2.1-0.3x=0.4x
-0.3x-0.4x=2.1
-0.7x= 2.1/(-0.7)
x= -3