32-5x=28x=()
选一选当x=8时,9x+7x128, 9x+7128
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=
>
选一选当x=2.5时,5x+11x40, 5x+1140
选一选
选一选当x=7时,7x-2540, 7x+2540
5.6x-5x=30
x=(_)
0.3x=15x=()
6x+5x=2.2x=()