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2x-3=10
2x=10+3
x=13/2
x=6,5
2)
3x+15=315
3x=315-15
x=300/3
x=100
3)
x/7=7
x=7×7
x=49
4)
10/4+5=7,5
2,5+5=7,5
5)
10x=400
x=400/10
x=40