2.8x-4.3=9.7
2.8x=14
x=14/2.8
x=5是减4又10分之3减4又10分之34又10分之3=4.3
是减的2.8X为什么等于142.8x-4.3=9.7 将 -4.3移到等式右边
2.8x=9.7+4.3
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