3.5+2.1x=4.2,
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3.5+2.1x=4.2,3.5+2.1x=4.2,3.5+2.1x=4.2,3.5+2.1x=4.22.1x=4.2-3.52.1x=0.7x=1/33.5+2.1x=4.22.1x=0.7x=1/
3.5+2.1x=4.2,
3.5+2.1x=4.2,
3.5+2.1x=4.2,
3.5+2.1x=4.2
2.1x=4.2-3.5
2.1x=0.7
x=1/3
3.5+2.1x=4.2
2.1x=0.7
x=1/3
3.5+2.1x=4.2,
4.2x-x=25.6 x÷7=2.1
6.4x-3.5=3.6x+2.1
9x-0.9乘7=2x+2.1 x=?9x-0.9乘7=2x+2.1 x=?还有：3(2x-1.2)=2(x+3.5) x=?2.4x-9.8=1.4x-9
4.2-0.6x=3.6x 5x+2x=33.6 7x-4x=0.75 2x+7x+2.1=12 56x-32x-119=361 x+5=2x 3x+9=6x 4x-28=2x 2x+18=7x 5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2）除2=71
3.6x*(2.1-x)=4.8x
1.53x-15x=762.8（x+5)=563.6.8x-2x=4.2 4 .2x/3=185 .7x=8.19乘3 6 4.5x+45=907 2x+3.5乘2=188 x-2.6x3=1.09用性质 2 做如 x/3=2.1 x/3x3=2.1x3x=6.3这种方法 不要用算式
3.5x-x=7.x=?
3.5:x=5:4.2
2.4x-x=2.1
x-0.8x=4.2
解方程；4.2X-2.5-1.9X=2.1
3.5x-x=17.5
x+12.5=3.5x
x+12.5=3.5x
4.5X-X=3.5
x+12.5=3.5x
x+3.5x=9.