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5x=15
x= 3
3x-10=2-x
3x+x=2+10
4x=12
x=12÷4
x=3
3.
5x-7=8
5x=8+7
5x=15
x=15÷5
x=3
4.
2/3y-15=3
2/3y=3+15
2/3y=18
y=18÷2×3
y=27