Answer:
subtract 2.4 from both sides, simplify to -3x=16.8, divide by -3, simplify to x=-5.6.
Explanation:
-3x + 2.4 = 19.2
v -2.4 -2.4
v 0 16.8
-3x=16.8
-3 -3
x=-5.6
hope this helps,
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