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341. x+3x=24,    4x=24,    x=24÷4=6,  6×3=18

x+2x=63, 3x=63, x=63÷3=21, 21×2=42

342. x+2x=60, 3x=60, x=60÷3=20, 20×2=40

x+7x=72, 8x=72, x=72÷8=9, 9×7=63

343. x+4x=20, 5x=20, x=20÷5=4, 4×4=16

x+3x=16, 4x=16, x=16÷4=4, 4×3=12

344. x+12x=124, 13x=124, x=124÷13