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=4x + 24 +3x +6
=7x + 30
2.6x + 21 = 5x - 20
=6x +21 +5x -20
=11x + 1
5.5y - 20 +2y = 6y - 18
=5y - 20 + 2y + 6y - 18
=13y -38