3(X+2.1)=10.5 2(X-3)=5.8 13(X+5)=169 X/1.44=0.4 5X+7=42 3.85=1.5=6.1 X/4.2=2 6X-0.9=4.5

3(X+2.1)=10.5 2(X-3)=5.8 13(X+5)=169 X/1.44=0.4 5X+7=42 3.85=1.5=6.1 X/4.2=2 6X-0.9=4.5

3(X+2.1)=10.5
x=1.4
2(X-3)=5.8
x=2.9
13(X+5)=169
x=8
X/1.44=0.4
x=0.576
5X+7=42
x=7
3.85=1.5=6.1
이것 은 무엇 입 니까?
X/4.2=2
x=8.4
6X-0.9=4.5
x=0.9