Упростите выражение: а) 4(5x-y)-3(y+6x)=20x-4y-3y-6x ; Б) -6(9а+2b)+4(a-7b); в) 5(2x-3)-2(3-2x)=15-6(x+1) ; г) 2-3(2x-1)=1-7(x-5) ; д) 7(4-3x)-(8,5-x)=4-3(x-8)
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б) -54a-12b+4a-28b=-50a-40b=-10(5a+4b)
в)10x-15-6+4x=15-6x-1, 20x=35, x=1.75
г) 2-6x+1=1-7x+35, x=33
д) 4-3x-8.5+x=4-3x+24, x=32.5