Répondre :
3x+5x -42=3x-22-3x 5 (27-x)=10x+25
42-3x+5x-42=-22+42 5*27-5*x=10x+25
8x=20 5x-135-5x=10x+25+5x
8x/8=20/8 25+135=10x+25+5x-25
x=20/8 160=15x
x=5/2 160/15=15x/15
x=160/15
x=32/3
42-3x+5x-42=-22+42 5*27-5*x=10x+25
8x=20 5x-135-5x=10x+25+5x
8x/8=20/8 25+135=10x+25+5x-25
x=20/8 160=15x
x=5/2 160/15=15x/15
x=160/15
x=32/3