х=примерно -20,95
Пошаговое объяснение:
120(х+21)+12=17
120х+2520+12=17
120х=17-12-2520
120х=-2515
х=-2515:120
х=примерно -20,95
120•(х+21)+12=17
120•(х+21)=17-12; 120•(х+21)=5;
х+21=5/120; х+21=1/24
х=(1/24)-21
х=-20 23/24
120•(х+21)+12=17
120х+120*21+12=17
120х=17-12-120*21
120х=5-2520
120х=-2515
х=-2515/120
х=-503/24
х=-20 23/24
