Помагите срочно -9-(8х-11)=12 11х+103=1+(12х-31) (2х+3)+(3х+4)+(5х+5)=12-7х 6х=1-(4-6х)

1) —9 — (8x — 11) = 12 —9 — 8x + 11 = 12 —8x = 12 — 11 + 9 —8x = 10 x =  =  = —1,25; 2) 11x + 103 = 1 + (12x — 31) 11x + 103 = 1 + 12x — 31 11x — 12x = 1 — 31 — 103 —x = —30 — 103 —x = —133 x = 133;  3) (2x + 3) + (3x + 4) + (5x + 5) = 12 — 7x 2x + 3 + 3x + 4 + 5x + 5 = 12 — 7x (2x + 3x + 5x) + (3 + 4 + 5) = 12 — 7x 10x + 12 = 12 — 7x 10x + 7x = 12 — 12 17x = 0 x =  = 0;  4) 6x = 1 — (4 — 6x) 6x = 1 — 4 + 6x 6x — 6x = 1 — 4 0x = —3 Уравнение не имеет решений.