8t+2-(5+7t)-4m помогите решить

8t+2-(5+7t)-4m = = 8t+2-5-7t-4m = = 1t - 3 - 4m = = t - 3 - 4m----------------------------------------

8t+2-(5+7t)=4m2-(5+7t)=4m-8t-(5+7t)=4m-8t-2-7t=4m-8t-2+5-7t+8t=4m+3t=4m+3