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180 - 34 = 4x + x
146 = 5x
146/5 = x
2) 3(5+x)+7(9-x)=108+x
15+3x+63-7x=108+x
3x-7x-x=108-15-63
3x-8x=108-78
-5x=30
x=30/-5
x=-6
3) x+2=9; x=9-2; x=7
4) falta informacion
5) 11(23-2x)-2(9-x)=31x+149
11(23)+11(-2x)+(-2)(9)+(-2)(-x)=31x+149
253-22x-18+2x=31x+149
253-18-149=31x+22x-2x
253-167=53x-2x
86=51x
86/51=x