1.2x + 4x=90,x=....
2.3x +5x=1000,x=....
3.9x + 8x + 25=1000,x=....
4.5x -2x=......,x=25
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1.2x + 4x=90,x=....
2.3x +5x=1000,x=....
3.9x + 8x + 25=1000,x=....
4.5x -2x=......,x=25