(5x-12)÷5=7×(x+12)
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(5x-12)÷5=7×(x+12)(5x-12)÷5=7×(x+12)(5x-12)÷5=7×(x+12)(5x-12)/5=7(x+12)5x-12=35(x+12)5x-12=35x+4205x
(5x-12)÷5=7×(x+12)
(5x-12)÷5=7×(x+12)
(5x-12)÷5=7×(x+12)
(5x-12)/5=7(x+12)
5x-12=35(x+12)
5x-12=35x+420
5x-35x=420+12
-30x=432
x=-14.4
(5x-12)÷5=7×(x+12) 两边乘5
(5x-12)=35×(x+12)
5x-12=35x+12*35
35x-5x=-12-12*35
30x=-12*36
x=-432/30
x=-72/5
解:
0.2(5x-12)=7(x+1)
x-2.5=7x+7
x=-14.4
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
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(5x-12)÷5=7×(x+12)