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3x+3=63-3
3x=60:3x
x=20
20+(20+1)+(20+2)=20+21+22=63
x+(x+2)+(x+4)+(x+6)=68
4x+12=68-12
4x=56:4
x=14
14+(14+2)+(14+4)+(14+6)=14+16+18+20=68
x+(x+2)+(x+4)+(x+6)=56
4x+12=56
4x=56-12
4x=44:4
x=11
11+(11+2)+(11+4)+(11+6)=11+13+15+17=56