68. Решите уравнение: 1) (x - 34) + 15 = 61; 2) (k - 36) - 43 = 72; 3) (37 + d) - 58 = 49; 4) 957 - (t + 336) = 428; 5) 325 - (a - 617) = 219; 6) 468 - (259 - c) = 382.

Решим каждое уравнение по отдельности: 1) $$(x - 34) + 15 = 61$$ $$x - 34 = 61 - 15$$ $$x - 34 = 46$$ $$x = 46 + 34$$ $$x = 80$$ 2) $$(k - 36) - 43 = 72$$ $$k - 36 = 72 + 43$$ $$k - 36 = 115$$ $$k = 115 + 36$$ $$k = 151$$ 3) $$(37 + d) - 58 = 49$$ $$37 + d = 49 + 58$$ $$37 + d = 107$$ $$d = 107 - 37$$ $$d = 70$$ 4) $$957 - (t + 336) = 428$$ $$t + 336 = 957 - 428$$ $$t + 336 = 529$$ $$t = 529 - 336$$ $$t = 193$$ 5) $$325 - (a - 617) = 219$$ $$a - 617 = 325 - 219$$ $$a - 617 = 106$$ $$a = 106 + 617$$ $$a = 723$$ 6) $$468 - (259 - c) = 382$$ $$259 - c = 468 - 382$$ $$259 - c = 86$$ $$c = 259 - 86$$ $$c = 173$$ Ответ: 1) x = 80; 2) k = 151; 3) d = 70; 4) t = 193; 5) a = 723; 6) c = 173