2.8x＝19.32-6.4x
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2.8x＝19.32-6.4x2.8x＝19.32-6.4x2.8x＝19.32-6.4x2.8x+6.4x=19.329.2x=19.32x=2.12.8x＝19.32-6.4x2.8x+6.4x=
2.8x＝19.32-6.4x
2.8x＝19.32-6.4x
2.8x＝19.32-6.4x
2.8x+6.4x=19.32
9.2x=19.32
x=2.1
2.8x＝19.32-6.4x
2.8x+6.4x=19.32
9.2x=19.32
x=2.1
(2.8+6.4)x=19.32,9.2x=19.32,x= 2.1
x=2.1