Question

12+(-7+(3+-)-(8-(-4-2+7)-3​

Answer 1

$12+\left(-7+\left(3\right)-\left(8-\left(-4-2+7\right)-3\right)\right)\\-7+\left(3\right)-\left(8-\left(-4-2+7\right)-3\right)\\8-\left(-4-2+7\right)-3\\-4-2+7\\-4-2=-6\\=-6+7\\-6+7=1\\=1\\=8-1-3\\8-1-3\\8-1=7\\=7-3\\7-3=4\\=4\\=-7+\left(3\right)-4\\=-4-4\\-4-4=-8\\=-8\\=12-8\\\\12-8=4\\\\=4$