3х = 2,4*(х+15)
3х = 2,4х + 2,4 * 15
3х = 2,4х + 36
3х - 2,4х = 36
0,6х = 36
х = 36 : 0,6
х = 360 : 6
х = 60
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3х = 2,4*(х+15)
3х = 2,4х + 2,4 * 15
3х = 2,4х + 36
3х - 2,4х = 36
0,6х = 36
х = 36 : 0,6
х = 360 : 6
х = 60
3х=2,4х+36
3х-2,4х=36
0,6х=36
Х=36:0,6
Х=60