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13x=495
x=495/13
x=38,07
2) 3x=9
x=9/3
x=3
3) 3x-3x+3x=12
3x=12
x=12/3
x=4
4) 2(3x+5x)=100
6x+10x=100
16x=100
x=100/16
x=6,25
5) 3(3x+2x+3+)=50
9x+6x+9x=50
24x=50
x=50/24
x=2,08