2.8x＝19.32-6.4x

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2.8x＝19.32-6.4x
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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

2.8x＝19.32-6.4x 2.8x=19.32-6.4x 2.0x＝19.32－6.4x 2.8x＝19.32－6.4x解方程,写在本子上, x x X x x x x x x x x |x| X x