2x + 5 +3x =20 6x +2x+x +3 = 30 4+x +7+x =33 3n-40+2n=15 13x -7 -10x =2
3x+3x +1 = 25
7g + 14 -3g =6
10y -3y + 5 = 54
8f +3 - 2f -2 = 31
12b -5 -2b = 25
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