(5x-3)+(7x-4)=8-(15-11x)
(4x+3)-(10x+11)=7+(13-4x)
1) 5x-3+7x-4=8-15+11x5x+7x-11x=8-15+3+41x=0x=0:1x=02) 4x+3-10x-11=7+13-4x4x-10x+4x=7+13-3+11-2x=28x=28:(-2)x=-14
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