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2x - 3 = 4x - 7
2x - 4x = 3 - 7
-2x = -4
2x = 4
x = 4/2
x = 2
(17.2) - (7.2) = 34 - 14 = 20
2x-4x = -7+3
-2x = -4
x = 2
17(2) - 7(2)
= 34 - 14 = 20