7.8X+5=44 3.4X-6=4.2

问题描述:

7.8X+5=44 3.4X-6=4.2

7.8X+5=44
7.8X=44-5
7.8X=39
X=39÷7.8
X=5
3.4X-6=4.2
3.4X=4.2+6
3.4X=10.2
X=10.2÷3.4
X=3