Answer:
11. 3x+7=x+15
3x-x=15-7
2x=8
x=4
12.?
13. 6x-3=51
6x=51+3
6x=54
x=9
51+83=134
180-134=46
7y-10=46
7y=46+10
7y=56
y=8
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Answers & Comments
Answer:
11. 3x+7=x+15
3x-x=15-7
2x=8
x=4
12.?
13. 6x-3=51
6x=51+3
6x=54
x=9
51+83=134
180-134=46
7y-10=46
7y=46+10
7y=56
y=8