diff --git a/exercise7/lib.typ b/exercise7/lib.typ
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+#let title(cont, size: 18pt) = align(center)[
+  #text(size: size * 2, weight: "bold")[#underline[#cont]]
+]
diff --git a/exercise7/main.pdf b/exercise7/main.pdf
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diff --git a/exercise7/main.typ b/exercise7/main.typ
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+#import "lib.typ"
+
+#let FONT_SIZE = 18pt;
+
+#set page(paper: "a4", margin: (x: 2.6cm, y: 2.8cm), numbering: "1 : 1")
+#set par(justify: true, leading: 0.52em)
+
+#set text(font: "FreeSerif", size: FONT_SIZE, lang: "us")
+#show math.equation: set text(
+  font: "Euler Math",
+  size: (FONT_SIZE * 1.0),
+  lang: "en",
+)
+
+#set heading(numbering: none)
+#show heading.where(level: 1): it => {
+  rect(inset: FONT_SIZE / 2)[#it]
+}
+
+these are my solutions to the seventh exercise set of TMA4135.
+
+this document was created using
+#link("https://typst.app/")[#text(blue.darken(5%))[typst]].
+
+#lib.title(size: FONT_SIZE)[exercise 7]
+
+\
+
+#outline(title: none)
+
+#pagebreak()
+
+= problem 1
+
+#include "problem1.typ"
+
+